[{"condition_id":"swift","condition":"Swift Qwen3.8 27B Q8 / MTPLX medium MTP","task":"source_summary","final_text":"Pilot Reminder System: Briefing for the Director\n\nThe Westhaven library service ran a six-week pilot of an appointment-reminder system at four of its twelve branches, covering computer-help appointments. During the pilot, the missed-appointment rate fell from 20% to 15%, a five-percentage-point drop, and the number of missed appointments fell from 100 to 90. Bookings rose by 20%. In a survey of 80 invited users, 28 of 40 respondents preferred the new reminder, eight had no preference, and four preferred the old one. Staff reported the reminders were easier to manage, though staff time was not formally measured.\n\nThe evidence has significant limits. The four branches volunteered rather than being randomly selected, and the other eight were not measured. Staff changed reminder wording during the pilot, so the team cannot separate the software's effect from the wording change, seasonal demand, or the particular branches. The comparisons are descriptive, not causal. The survey describes only its respondents, not all users. A delivery-failure log was incomplete, and no accessibility assessment for low-vision users was completed.\n\nTotal pilot spending was EUR 6,000: EUR 4,000 setup and EUR 2,000 for the six-week subscription. The supplier quoted EUR 12,000 per year for a twelve-branch subscription, excluding staff training. No training cost estimate or net-savings calculation exists, and the pilot setup cost should not be conflated with the annual fee.\n\nThe service manager recommended an eight-week follow-up at the same four branches, adding a complete delivery log, measured staff time, and an accessibility review. The governing board has not approved the follow-up or a wider rollout. Its next meeting is 3 September; no rollout date has been agreed.","finish_reason":"stop","seconds":229.97213199990802,"tokens":4295,"decode_tps":18.872,"client_tps":null,"quality_score":93.0,"dimension_scores":{"factual_faithfulness":5,"decision_relevant_coverage":5,"clarity_organization":4,"natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"swift","condition":"Swift Qwen3.8 27B Q8 / MTPLX medium MTP","task":"knowledge_explainer","final_text":"Why the City Holds Its Breath: Understanding the Urban Heat Island\n\nStep outside your apartment at ten on a summer evening and you might notice something odd: the air feels thick and warm, while a friend in the countryside an hour away reports a cool, breezy night. This is not a trick of the thermometer. Cities genuinely run warmer than the surrounding rural landscape, and the gap is most noticeable after sunset. Planners call this the urban heat island effect, and it is one of the most tangible ways a city's design shapes daily life.\n\nThe reason is mostly about materials and geometry. During the day, asphalt roads, concrete sidewalks, and dark rooftops absorb sunlight more readily than grass, soil, or tree canopy. They store that energy in their mass. When the sun drops below the horizon, the countryside cools quickly because vegetation releases stored heat through evaporation and transpiration, and open ground radiates warmth back into the sky. In a city, the dense walls of buildings trap that stored heat in narrow streets, and the mass of concrete and brick keeps releasing it slowly into the air. Add the waste heat from car engines, air-conditioning units, and industrial processes, and the city becomes a slow-cooking oven that keeps radiating warmth long after the countryside has cooled.\n\nIt is worth separating this local phenomenon from global climate change. The urban heat island is a daily, neighborhood-scale effect driven by surface materials and city layout. Climate change is a planetary, decades-long shift in average temperatures caused by greenhouse gas accumulation. They interact—warming summers make the heat island feel more extreme—but they are distinct problems with distinct causes. A city can reduce its heat island without reversing climate change, and addressing climate change will not eliminate the temperature gap between downtown and the farmland beyond.\n\nWhat can residents do? Planting a tree in a yard or community garden is one of the most effective individual actions, because leaves shade the ground and their roots release moisture that cools the air. Painting a roof a lighter color, installing a small green roof, or simply reducing car traffic all help. These steps are modest in scale, but they work best when many neighbors adopt them together, because a single tree in a sea of asphalt has limited effect.\n\nCity planners have a broader toolkit. They can mandate lighter-colored paving, require green roofs on new buildings, widen tree-lined streets, and preserve open spaces that act as cooling corridors. Permeable surfaces that let water soak in, rather than sheeting off into storm drains, also help because evaporation from the ground pulls heat from the air. Some cities are redesigning street geometry to let wind flow through neighborhoods rather than being blocked by a wall of buildings.\n\nThere are trade-offs. Trees need water, and in drought-prone regions, a dense urban canopy can strain local water supplies. Green roofs add construction cost and require maintenance. Replacing asphalt with permeable pavement can be expensive and may not suit heavy traffic. Planners also face a tension between density—which reduces car trips and preserves farmland on the city's edge—and the cooling benefits of open, vegetated space. No single solution eliminates the heat island; the goal is to layer interventions so the city sheds heat more efficiently while remaining livable and compact.\n\nThe next time the evening air over the city feels heavier than it should, you are feeling the accumulated warmth of a day's sunlight, held in stone and steel. It is a problem of design, and like most design problems, it can be improved one surface, one tree, one street at a time.","finish_reason":"stop","seconds":636.4967891669367,"tokens":11681,"decode_tps":18.374,"client_tps":null,"quality_score":75.0,"dimension_scores":{"factual_accuracy":3,"clarity_explanation":4,"organization_flow":4,"concrete_useful_detail":4,"natural_voice":4,"brief_compliance":5},"factual_errors":[{"severity":"moderate","quote":"their roots release moisture that cools the air","explanation":"Roots take up water; transpiration releases water vapor mainly through leaves. The physiological mechanism is wrong even though the overall cooling recommendation is sound."},{"severity":"minor","quote":"vegetation releases stored heat through evaporation and transpiration","explanation":"Evapotranspiration consumes energy to convert water to vapor; this wording confuses evaporative cooling with the release of previously stored sensible heat, particularly in its after-sunset explanation."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"swift","condition":"Swift Qwen3.8 27B Q8 / MTPLX medium MTP","task":"data_to_report","final_text":"MEMO\nTo: Operations Manager\nFrom: Analyst\nDate: [Date]\nSubject: Checkout Change and Conversion Rates\n\nThe overall conversion rate rose from 11.0% in Period A (1,100 orders / 10,000 visits) to 13.5% in Period B (1,350 / 10,000). By device, desktop conversion fell from 20.0% (200/1,000) to 18.0% (900/5,000), and mobile conversion fell from 10.0% (900/9,000) to 9.0% (450/5,000). The overall increase is therefore not supported by device-level performance; it is driven by a much larger share of visits coming from desktop in Period B (50% versus 10%).\n\nThe sales director’s claim that the new checkout “must be better” is not justified. The periods were not a controlled experiment, and the marketing team also changed its advertising mix. Because traffic composition changed, the overall rate can rise even when every device-specific rate falls. We can conclude only that the observed overall conversion increased and that both device-specific rates decreased. We cannot conclude that the checkout caused the increase, that the new checkout is better, or that performance would have been higher under the old checkout with the same traffic mix. We also cannot assess revenue, profit, returning customers, acquisition cost, or source-level conversion because those data are not provided.\n\nA useful next step is to run a randomized A/B test of the old and new checkout, keeping the advertising mix stable and balancing device mix across test arms. The test should measure conversion, and ideally downstream business outcomes, before deciding whether to keep the new checkout.","finish_reason":"stop","seconds":151.0297292091418,"tokens":2613,"decode_tps":17.491,"client_tps":null,"quality_score":95.0,"dimension_scores":{"numerical_accuracy":5,"interpretation_causal_caution":5,"decision_usefulness":5,"clarity_natural_prose":4,"brief_compliance":4},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"swift","condition":"Swift Qwen3.8 27B Q8 / MTPLX medium MTP","task":"editorial_rewrite","final_text":"Subject: Update on the optional document search beta\n\nHi [Name],\n\nI wanted to share a status update on the optional document search beta we've been developing.\n\nTo be clear: this is a new, optional beta feature. Your current search remains fully available, and you don't need to switch.\n\nOur engineering team has targeted October 14 for enabling the beta, but quality assurance has not yet signed off, so I can't confirm that date. I'll email you with opt-in instructions once the feature is ready. There is nothing you need to do today.\n\nIn our internal testing, 50 document-search queries ran at a median of 7 seconds on the current service and 5 seconds on the beta. That was a small internal test, not a customer study, so individual results may differ.\n\nOne known limitation: beta searches can miss newly uploaded documents for up to 15 minutes. The current search does not have that delay. Neither version deletes or modifies your documents.\n\nIf you do opt in, you can return to the current search at any time. The beta carries no extra cost during the beta period; pricing after that has not been decided.\n\nI'll follow up when there's more to share.\n\nThanks,\n[Name]","finish_reason":"stop","seconds":165.45226549985819,"tokens":3020,"decode_tps":18.431,"client_tps":null,"quality_score":87.0,"dimension_scores":{"factual_preservation":5,"reader_usefulness":4,"tone_natural_prose":4,"organization_concision":4,"brief_compliance":4},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"original","condition":"Original Qwen3.8 27B Q8 / MTPLX medium MTP","task":"source_summary","final_text":"Pilot Reminder System: Briefing\n\nThe Westhaven library service ran a six-week pilot of an appointment-reminder system at four of its twelve branches, covering computer-help appointments from 6 July to 16 August 2026. During the pilot, the missed-appointment rate at those branches fell from 20% to 15%, and bookings rose by 20%. A survey of 80 users drew 40 responses: 28 preferred the new reminder, 8 had no preference, and 4 preferred the old one. Staff reported the reminders were easier to manage, though staff time was not formally measured.\n\nThe evidence has significant limits. The four branches volunteered rather than being randomly selected, and the other eight branches were not measured. Staff also changed reminder wording during the pilot, so the team cannot separate the software's effect from the wording change, seasonal demand, or the particular branches involved. The comparisons are descriptive, not causal. Two users received duplicate reminders (both fixed), the delivery-failure log was incomplete, and no accessibility review for low-vision users was completed.\n\nTotal pilot spending was EUR 6,000 (EUR 4,000 setup, EUR 2,000 six-week subscription). The supplier quoted EUR 12,000 per year for a twelve-branch subscription, excluding staff training. No training cost estimate or net-savings calculation exists, and the pilot setup cost should not be conflated with the proposed annual fee.\n\nOn 19 August the service manager recommended an eight-week follow-up at the same four branches, adding a complete delivery log, measured staff time, and an accessibility review. The governing board has not approved the follow-up or any wider rollout. Its next meeting is 3 September, and no rollout date has been agreed.","finish_reason":"stop","seconds":326.6401654998772,"tokens":6252,"decode_tps":19.32,"client_tps":null,"quality_score":88.0,"dimension_scores":{"factual_faithfulness":5,"decision_relevant_coverage":4,"clarity_organization":4,"natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"original","condition":"Original Qwen3.8 27B Q8 / MTPLX medium MTP","task":"knowledge_explainer","final_text":"Why the City Holds Its Breath: Understanding the Urban Heat Island\n\nStep outside at ten on a summer evening, and you might notice something odd: the air still feels thick and warm, while a friend in the countryside reports a cool, breezy night. This is not a trick of the thermometer. It is a well-understood local phenomenon called the urban heat island, and it has a straightforward physical explanation.\n\nDuring the day, the surfaces that dominate a city—dark asphalt roads, concrete sidewalks, brick and glass facades—soak up enormous amounts of sunlight. Unlike grass, soil, or a lake, these materials do not use much of that energy to evaporate water. Instead, they store it as heat in their mass. A thick slab of concrete can hold that warmth for hours, radiating it back into the air long after sunset. The countryside, by contrast, is covered in vegetation and soil that release much of the day's energy through evaporation and transpiration, so the ground cools more quickly once the sky darkens.\n\nCity geometry compounds the effect. Tall buildings and narrow streets create canyons that trap warm air and slow the wind that would otherwise carry it away. Surfaces re-radiate heat toward one another in a kind of thermal echo. Add waste heat from air conditioners, vehicles, and industry, and the urban core becomes a slow-cooking oven releasing warmth into the night.\n\nIt is worth separating this local heating from global climate change. The urban heat island is a micro-scale, immediate effect: it happens every summer evening in virtually every city, regardless of whether the planet's average temperature is rising. Climate change, by contrast, is a long-term shift in the global energy balance driven by greenhouse gases. The two interact—a warming climate intensifies heat islands—but they are distinct mechanisms at different scales.\n\nWhat can be done? Residents have modest but real levers. Planting a mature tree in a yard or on a street provides shade and releases moisture through its leaves, cooling the immediate area. Painting a roof lighter, adding a small green roof, or installing a patio shade all reduce how much heat a building stores. Reducing idling in traffic and choosing energy-efficient appliances trims the waste-heat contribution.\n\nCity planners operate at a larger scale. Expanding the tree canopy, designing streets with open corridors for wind flow, specifying lighter paving, and requiring green roofs on new buildings can lower a district's peak temperature. Permeable surfaces that let water soak in also help, because ground evaporation carries heat away.\n\nNone of these measures is a complete fix, and each carries trade-offs. Trees need water, space, and maintenance, and they cannot be planted everywhere in a dense downtown. Green roofs add construction cost and structural load. Lighter-colored surfaces reflect heat onto neighboring buildings rather than eliminating it. A city cannot simply spread out, because lower density increases driving and its waste heat. The goal is not to make a city feel like a meadow, but to reduce the excess heat that makes summer nights uncomfortable and, in extreme cases, dangerous for the elderly and those without air conditioning.\n\nThe urban heat island is not a mystery and not a reason for despair. It is a consequence of the materials and shapes we choose, which means it is also something we can reshape—block by block, roof by roof, tree by tree.","finish_reason":"stop","seconds":650.2591679170728,"tokens":12162,"decode_tps":18.727,"client_tps":null,"quality_score":75.0,"dimension_scores":{"factual_accuracy":3,"clarity_explanation":4,"organization_flow":4,"concrete_useful_detail":4,"natural_voice":4,"brief_compliance":5},"factual_errors":[{"severity":"moderate","quote":"it happens every summer evening in virtually every city","explanation":"Urban-rural temperature differences vary with weather, geography, surface cover and time. Calm clear conditions strengthen the effect; the universal evening claim is too strong."},{"severity":"moderate","quote":"Lighter-colored surfaces reflect heat onto neighboring buildings rather than eliminating it.","explanation":"Reflected sunlight can strike neighbors but can also escape upward; this is not an inevitable local transfer. Cool materials can reduce absorbed/stored solar energy."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"original","condition":"Original Qwen3.8 27B Q8 / MTPLX medium MTP","task":"data_to_report","final_text":"To: Operations Manager\nSubject: Checkout change assessment\n\nThe sales director’s claim that the new checkout is better because overall conversion rose is not supported. In Period A, overall conversion was 1,100 orders / 10,000 visits = 11.0%. In Period B, it was 1,350 / 10,000 = 13.5%. By device, desktop conversion fell from 200/1,000 = 20.0% to 900/5,000 = 18.0%, and mobile conversion fell from 900/9,000 = 10.0% to 450/5,000 = 9.0%.\n\nThe overall increase is explained by a traffic mix shift: desktop visits rose from 10% to 50% of total visits, while mobile fell from 90% to 50%. Because desktop converted at a higher rate in both periods, a larger desktop share raises the blended rate even though each device’s rate declined.\n\nWe cannot conclude that the checkout change caused the overall improvement. The marketing team also changed its advertising mix, and there was no randomized experiment or unchanged control group. We also cannot conclude that the new checkout is worse, because the same confounding prevents a clean causal comparison. The available data do not include revenue, profit, returning customers, acquisition cost, or source-level conversion, so business impact remains unknown.\n\nA useful next step is to run a controlled test: randomize visitors to the old and new checkout while holding the advertising mix constant, or at least stratify by device and source. Track conversion by device and overall, and compare the two checkouts under the same advertising mix. That would separate checkout effects from traffic-mix effects and provide a defensible decision.","finish_reason":"stop","seconds":418.71132491598837,"tokens":6904,"decode_tps":16.541,"client_tps":null,"quality_score":96.0,"dimension_scores":{"numerical_accuracy":5,"interpretation_causal_caution":5,"decision_usefulness":5,"clarity_natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"original","condition":"Original Qwen3.8 27B Q8 / MTPLX medium MTP","task":"editorial_rewrite","final_text":"Subject: Update on the optional document search beta\n\nHi,\n\nI wanted to give you a straightforward update on a new document search feature we're building.\n\nTo be clear: this is an optional beta feature, not a replacement for your current search. Your existing search remains fully available, and you don't need to switch.\n\nOur engineering team is targeting October 14 to enable the beta, but quality assurance hasn't signed off yet, so I can't confirm that date. I'll email you with opt-in instructions once it's ready. There's nothing you need to do today.\n\nIn our internal testing, 50 document-search queries ran at a median of 7 seconds on the current service and 5 seconds on the beta. That's a small internal sample, not a customer study, so I can't promise every user will see that difference.\n\nOne known limitation: the beta search can miss newly uploaded documents for up to 15 minutes. The current search doesn't have that delay. Neither version deletes or modifies your documents.\n\nIf you do opt in, you can return to the current search at any time. The beta costs nothing extra while it's in beta; pricing after that hasn't been decided.\n\nI'll follow up when there's more to share.","finish_reason":"stop","seconds":232.34742975002155,"tokens":3742,"decode_tps":16.224,"client_tps":null,"quality_score":88.0,"dimension_scores":{"factual_preservation":5,"reader_usefulness":4,"tone_natural_prose":4,"organization_concision":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget32k","task":"source_summary","final_text":"The pilot tested reminder software for computer-help appointments at four of twelve branches for six weeks, from 6 July to 16 August 2026. Compared with the six weeks before the pilot, bookings rose from 500 to 600, missed appointments fell from 100 to 90, and the missed-appointment rate fell from 20% to 15%. A draft saying misses fell by 25% was corrected: that is the relative reduction in the rate, not the reduction in missed appointments. Survey responses were mainly positive: of 40 respondents, 28 preferred the new reminder, eight had no preference, four preferred the old reminder. Staff said reminders were easier to manage.\n\nThe evidence is limited. The branches volunteered, not randomly selected, and the other eight branches were not measured. Staff changed reminder wording during the pilot; seasonal demand may have affected bookings. The comparisons are descriptive, not proof the software caused any change. Survey results describe respondents, not all users. Staff time was not formally measured. Two duplicate reminders were fixed, but delivery-failure data are incomplete and accessibility for low-vision users was not assessed.\n\nCosts were EUR 6,000 for the pilot: EUR 4,000 setup and EUR 2,000 subscription. The supplier quoted EUR 12,000 per year for all twelve branches, excluding training. There is no training estimate and no net-savings calculation. Setup and annual subscription must not be treated as the same cost or simply annualized together.\n\nThe service manager recommended an eight-week follow-up at the same four branches, with complete delivery logs, measured staff time, and an accessibility review. The board has not approved the follow-up or rollout; next meeting 3 September. No rollout date has been agreed.","finish_reason":"stop","seconds":125.236840874888,"tokens":8768,"decode_tps":null,"client_tps":70.01134760944073,"quality_score":93.0,"dimension_scores":{"factual_faithfulness":5,"decision_relevant_coverage":5,"clarity_organization":4,"natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget32k","task":"knowledge_explainer","final_text":"Why Cities Stay Warm After Dark, and How to Cool Them Down\n\nOn a summer evening, the countryside may cool quickly after sunset, while a city block still feels like an oven. This difference is called the urban heat island effect, and it is not a mystery. It is largely the result of replacing natural landscapes with materials and shapes that are very good at storing heat.\n\nDuring the day, asphalt, brick, concrete, and dark roofs absorb sunlight. Unlike soil or grass, these surfaces have little moisture to carry heat away through evaporation, so much of the energy goes into warming the material itself. Tall buildings and narrow streets add another problem: they can trap sunlight and block the sky, so heat that has been absorbed is released slowly rather than radiating freely into the night. Cars, factories, air conditioners, and people also add warmth, and smog or humidity can slow the escape of that heat. The result is a city that remains warmer than surrounding fields and forests after the sun has set.\n\nThis local warming is not the same thing as global climate change. Climate change refers to long-term shifts in Earth’s climate caused by greenhouse gases spreading through the atmosphere. The urban heat island is a neighborhood-scale effect created by what the ground and buildings are made of and how they are arranged. A city can have a strong heat island even in a region that is not getting hotter globally, and a cooler town can still be affected by global warming. The two issues can reinforce each other: hot cities often use more energy for cooling, which can add greenhouse gases if that energy comes from fossil fuels.\n\nResidents and planners can reduce the problem, but the best options depend on climate, budget, and local priorities. Trees are one of the most powerful tools. They shade streets and buildings, cool the air through evaporation, and break up large stretches of heat-absorbing pavement. Green roofs and light-colored roofs can also help, as can reflective paving materials. More open space, parks, and water features can lower temperatures, while building design can improve airflow and reduce trapped heat.\n\nYet each choice has trade-offs. Trees need water, space, and maintenance, and in some places they may increase humidity or block useful winter sunlight. Reflective roofs can reduce cooling demand in hot climates but may make heating more expensive in cold ones, and shiny surfaces can create glare. Green roofs can be costly, require strong roofs, and need careful waterproofing. Reducing pavement can improve cooling but may affect drainage, transportation, or the number of parking spaces. Ventilation corridors might cool a neighborhood but can also raise noise, privacy, or security concerns.\n\nThe most practical approach is usually a mix: add shade where people walk, choose cooler materials where they matter most, and design streets and buildings so they do not trap heat unnecessarily. The goal is not to make a city cold, but to make it more livable after sunset, with less wasted energy and fewer sweltering evenings.","finish_reason":"stop","seconds":32.44338799989782,"tokens":3262,"decode_tps":null,"client_tps":100.54436978068608,"quality_score":88.0,"dimension_scores":{"factual_accuracy":4,"clarity_explanation":5,"organization_flow":4,"concrete_useful_detail":4,"natural_voice":5,"brief_compliance":5},"factual_errors":[{"severity":"minor","quote":"Climate change refers to long-term shifts in Earth’s climate caused by greenhouse gases spreading through the atmosphere.","explanation":"This compresses contemporary greenhouse-driven warming into a definition of all climate change. Greenhouse-gas accumulation and altered energy balance would be more precise than spreading."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget32k","task":"data_to_report","final_text":"Decision Memo  \nTo: Operations Manager  \nSubject: Checkout change assessment  \n\nPeriod A had 10,000 visits and 1,100 orders, an overall conversion rate of 11.0%. Period B had 10,000 visits and 1,350 orders, or 13.5%. By device, desktop conversion fell from 20.0% (200/1,000) to 18.0% (900/5,000). Mobile conversion fell from 10.0% (900/9,000) to 9.0% (450/5,000).\n\nThe sales director’s claim is not supported. Overall conversion rose because traffic mix shifted sharply toward desktop. In Period A, desktop was 10% of visits; in Period B, it was 50%. Desktop converted higher in both periods, so simply having more desktop visits can raise the blended rate even when both device-specific rates decline.\n\nWe cannot conclude the checkout change improved performance. There was no randomized experiment or unchanged control group, and marketing changed its advertising mix. We lack within-source conversion rates, revenue, profit, returning customers, and acquisition cost, so the change may reflect advertising, customer mix, or checkout. The data show the aggregate rate increased, but device-level rates decreased.\n\nRecommend running a controlled checkout test: use randomized assignment or a stable holdout group within the same period, keeping advertising mix as constant as possible. This would isolate the checkout effect. Report device-specific and source-specific conversion rates, plus revenue and profit. If an experiment is not immediately feasible, analyze like-for-like segments and pre/post trends with traffic composition adjusted before making a checkout decision.","finish_reason":"stop","seconds":91.52850499982014,"tokens":7119,"decode_tps":null,"client_tps":77.7790481775485,"quality_score":86.0,"dimension_scores":{"numerical_accuracy":5,"interpretation_causal_caution":4,"decision_usefulness":4,"clarity_natural_prose":4,"brief_compliance":5},"factual_errors":[{"severity":"moderate","quote":"use randomized assignment or a stable holdout group within the same period, keeping advertising mix as constant as possible. This would isolate the checkout effect.","explanation":"Randomization can support the causal claim, but a merely stable, nonrandom holdout does not automatically isolate it. The alternative is stated too confidently."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget32k","task":"editorial_rewrite","final_text":"Subject: Optional document search beta update\n\nYou are enrolled in our beta, and we want to clarify an upcoming change. We are preparing an optional new beta feature for document search. Your existing search service will remain available, and you do not need to switch to try or use the new option.\n\nEngineering's current target is October 14 for enabling the beta feature, but QA has not signed it off yet, so treat that date as tentative. In internal testing, the same 50 document-search queries took a median of 7 seconds on the current service and 5 seconds on the beta. These were 50 queries, not 50 people, and this does not show what every customer will experience.\n\nWe also want to share a known limitation: beta searches can sometimes miss newly uploaded documents for as long as 15 minutes. The current search does not have that known delay. Neither search deletes or modifies your documents.\n\nThere is nothing for you to do today. If you later choose to opt in, you can return to the current search at any time. During the beta, the feature costs nothing extra; pricing after the beta has not been decided. We will email you when the beta feature is ready, with instructions for opting in.","finish_reason":"stop","seconds":63.23016020911746,"tokens":4143,"decode_tps":null,"client_tps":65.52252890547953,"quality_score":76.0,"dimension_scores":{"factual_preservation":4,"reader_usefulness":4,"tone_natural_prose":3,"organization_concision":4,"brief_compliance":5},"factual_errors":[{"severity":"minor","quote":"you do not need to switch to try or use the new option","explanation":"The source says customers do not have to switch, and must opt in if they want the beta. This wording can instead imply trying/using the beta requires no switch or opt-in."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud64k","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget64k","task":"source_summary","final_text":"Westhaven tested an appointment reminder system for computer help bookings at four of twelve branches for six weeks. The branches volunteered, were not randomly selected, and the other eight were not measured.\n\nDuring the pilot, the four branches recorded 600 bookings and 90 missed appointments, compared with 500 bookings and 100 missed appointments in the prior six weeks. The missed appointment rate fell from 20% to 15%. Missed appointments fell by 10%, while bookings rose by 20%. These are descriptive comparisons, not proof the software caused them. Reminder wording also changed, and seasonal demand may have affected results.\n\nSurvey results are limited: 40 of 80 invited users responded; 28 preferred the new reminder, eight had no preference and four preferred the old reminder. Staff said reminders were easier to manage, but staff time was not formally measured. Two duplicate reminders were reported and fixed, but delivery failure data are incomplete, and no accessibility review was done.\n\nCosts remain incomplete. The pilot cost EUR 6,000: EUR 4,000 setup and EUR 2,000 for the subscription over six weeks. The supplier quoted EUR 12,000 per year for a subscription covering twelve branches, excluding staff training. There is no training estimate or net savings calculation, and the setup cost and annual fee should not be treated as the same or simply annualized together.\n\nThe service manager recommended a follow-up at the same four branches for eight weeks, with a complete delivery log, measured staff time and an accessibility review. The board has not approved follow-up or rollout; it meets 3 September. No rollout date has been agreed.","finish_reason":"stop","seconds":177.79776429198682,"tokens":14376,"decode_tps":null,"client_tps":80.85590984367576,"quality_score":93.0,"dimension_scores":{"factual_faithfulness":5,"decision_relevant_coverage":5,"clarity_organization":4,"natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud64k","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget64k","task":"knowledge_explainer","final_text":"The City That Keeps Its Heat\n\nAfter sunset, a city can feel like a slow-release furnace. The countryside around it may cool quickly, while streets, apartment walls, and parking lots continue to give off warmth well into the night. The reason is not mysterious. During the day, dark, hard surfaces such as asphalt, brick, and concrete absorb sunlight and store it as heat. Unlike soil or grass, those materials can hold a lot of warmth in their mass. When the sun goes down, that stored energy leaks back into the air slowly. A field or forest, by contrast, has thinner, moister, more breathable cover and often a wider view of the sky, so it can shed heat more readily.\n\nCity shape makes the effect stronger. Tall buildings form narrow streets that trap warmth between them, reducing the amount of open sky through which heat can escape. Wind that would carry heat away is slowed by blocks of structures. Trees and vegetation are often missing, and where they are present they may be confined to small planting pits. Plants cool the air in two useful ways: they shade surfaces before sunlight can heat them, and they release water vapor, which takes energy from the surroundings. Pavement and roofs do little of this, so they become reservoirs of heat.\n\nIt is important to separate this local urban heating from global climate change. The city’s after-dark warmth comes mainly from the way the city itself has been built: its surfaces, geometry, and use of land. That local effect can make a neighborhood warmer than the countryside even without any change in the global climate. Still, the two issues are connected in practice. Global warming raises average temperatures and can make heat waves longer or more intense, so cities that already store heat may become even less comfortable at night. Urban heating is therefore a local design problem, not a simple proof of global warming, though both can worsen the same summer nights.\n\nResidents and planners have several practical options, but none is a magic fix. Homeowners and renters can help by choosing lighter roof colors where compatible with local rules, maintaining roof surfaces, using shade trees, awnings, or pergolas, and keeping air conditioners from dumping excess heat into shared courtyards. They can also water trees where local water supplies allow. City planners can do more by expanding tree canopy, creating green roofs, replacing some dark pavement with lighter or more permeable materials, preserving parks, and designing streets so that breezes are not completely blocked. A cooler city is not just one with a few shiny surfaces; it is one that manages sunlight, water, air movement, and building materials together.\n\nThere are trade-offs, though. Reflective roofs and pavements can reduce stored heat, but they may create glare or make streets look out of place in historic districts. Trees provide shade and cooling, yet they need water, space, and long-term care, and in some climates they can block useful winter sun. Green roofs can be effective, but they require structural support and maintenance. Better ventilation may cool some streets while complicating safety, noise, or privacy. The goal is not to eliminate every warm surface but to give the city more ways to release heat quickly after sunset, so nights become more livable without creating new problems during the day.","finish_reason":"stop","seconds":59.9385672500357,"tokens":3980,"decode_tps":null,"client_tps":66.40132026174899,"quality_score":87.0,"dimension_scores":{"factual_accuracy":5,"clarity_explanation":4,"organization_flow":4,"concrete_useful_detail":4,"natural_voice":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud64k","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget64k","task":"data_to_report","final_text":"To: Operations Manager  \nSubject: Checkout change, Period A vs Period B  \n\nThe overall conversion rate rose from 11.0% in Period A (1,100 orders / 10,000 visits) to 13.5% in Period B (1,350 / 10,000). However, both device-specific rates fell: desktop from 20.0% (200/1,000) to 18.0% (900/5,000), and mobile from 10.0% (900/9,000) to 9.0% (450/5,000). The overall increase is therefore explained by mix shift: Period A had 9,000 mobile and 1,000 desktop visits, while Period B was evenly split. Because desktop had higher conversion in Period A, moving traffic toward desktop raised the blended rate even though each device converted worse.\n\nThe sales director’s claim is not supported. The checkout change was not tested through a randomized experiment or unchanged control group, and the marketing team also changed advertising mix. We cannot isolate the checkout effect, nor determine whether the new checkout improved revenue, profit, returning customers, or acquisition cost. The data only show complete visit/order counts for two periods; they do not show conversion within individual advertising sources.\n\nRecommendation: do not conclude the new checkout is better. Next step should be a controlled comparison: route comparable traffic to old and new checkout simultaneously, using random assignment and a stable advertising mix, or at minimum analyze same advertising sources and device segments over time. Define primary outcomes beyond orders, including revenue/profit and cost, and measure conversion for each device and source.","finish_reason":"stop","seconds":48.77264954103157,"tokens":3867,"decode_tps":null,"client_tps":79.28624006261462,"quality_score":92.0,"dimension_scores":{"numerical_accuracy":5,"interpretation_causal_caution":5,"decision_usefulness":4,"clarity_natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud64k","condition":"Qwen3.8 Flash / OpenRouter Alibaba budget64k","task":"editorial_rewrite","final_text":"Subject: Update on the optional document search beta\n\nHello,\n\nAs a customer already enrolled in the beta, you do not need to do anything today. We want to share an update on the optional document search beta. This is not a replacement for your current search. The existing service will remain available, and you do not need to switch.\n\nEngineering is targeting October 14 to enable the beta feature, but QA has not signed off yet. Please treat that date as tentative; we will email you when the beta is ready, with instructions for opting in. If you opt in, you can return to the current search at any time.\n\nIn internal testing, the same 50 document-search queries took a median of 7 seconds on the current service and 5 seconds on the beta. This was not a customer study; it involved 50 queries, not 50 people, and does not prove everyone will see that improvement. We also know beta searches can sometimes miss newly uploaded documents for up to 15 minutes. The current search does not have that known delay. Neither search deletes or modifies your documents.\n\nThe feature costs nothing extra during the beta. Pricing afterward has not been decided.","finish_reason":"stop","seconds":112.14591958303936,"tokens":8258,"decode_tps":null,"client_tps":73.63620567474412,"quality_score":92.0,"dimension_scores":{"factual_preservation":5,"reader_usefulness":5,"tone_natural_prose":4,"organization_concision":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud27b64k","condition":"Qwen3.8 27B BF16 / OpenRouter DeepInfra budget64k","task":"source_summary","final_text":"\n\n**Pilot Reminder System: Briefing for the Director**\n\nThe Westhaven library service tested an appointment-reminder system at four of its twelve branches over six weeks in 2026. The system covered computer-help appointments. During the pilot, the missed-appointment rate fell from 20% to 15%, and the number of missed appointments dropped from 100 to 90. Bookings rose by 20%. In a survey of 80 invited users, 28 of 40 respondents preferred the new reminder, eight had no preference, and four preferred the old one. Staff reported the reminders were easier to manage.\n\nHowever, the evidence has significant limits. The four branches volunteered rather than being randomly selected, and the other eight branches were not measured. Staff also changed the wording of reminder messages during the pilot, so the team cannot separate the effects of the software, the wording change, seasonal demand, or the branches involved. The survey results describe only respondents, not all users. Staff time was not formally measured. A delivery-failure log was incomplete, and no accessibility assessment for users with low vision was completed.\n\nOn cost, the pilot spent EUR 6,000 (EUR 4,000 setup, EUR 2,000 subscription). The supplier has quoted EUR 12,000 per year for a twelve-branch subscription, excluding staff training. No training cost estimate or net-savings calculation exists. The pilot setup cost and the proposed annual fee are not the same thing and should not be combined.\n\nThe service manager recommended an eight-week follow-up at the same four branches, with a complete delivery log, measured staff time, and an accessibility review. The governing board has not approved the follow-up or a wider rollout. Its next meeting is 3 September, and no rollout date has been agreed.","finish_reason":"stop","seconds":147.0097871250473,"tokens":6617,"decode_tps":null,"client_tps":45.01060867717294,"quality_score":86.0,"dimension_scores":{"factual_faithfulness":4,"decision_relevant_coverage":5,"clarity_organization":4,"natural_prose":4,"brief_compliance":5},"factual_errors":[{"severity":"minor","quote":"should not be combined","explanation":"The source prohibits conflating setup with the annual fee or simply annualizing them together. It does not prohibit combining distinct one-time and recurring costs in a correctly specified budget."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud27b64k","condition":"Qwen3.8 27B BF16 / OpenRouter DeepInfra budget64k","task":"knowledge_explainer","final_text":"\n\nWhy Your City Won't Cool Down\n\nIf you've ever driven out of a city at night and felt the temperature drop within minutes, you've experienced one of the most visible effects of urban life. Cities don't just feel warmer during the day—they hold onto that heat long after the sun has set, and the gap between urban and rural temperatures can be most dramatic in the cool hours of the night.\n\nThe reason comes down to what a city is made of. Concrete, asphalt, and brick absorb sunlight during the day and store it as heat. They release that energy slowly, like a stone that stays warm to the touch long after the sun has moved on. In the countryside, grass and soil also absorb heat, but they do so differently. Much of the energy that hits a leaf or a patch of ground goes into evaporating water, which carries heat away as invisible vapor. A city, with its sealed surfaces and limited vegetation, has far less of this natural cooling mechanism.\n\nAdd to this the geometry of urban life. Tall buildings create narrow canyons that trap warm air near the ground and slow the wind that would otherwise carry it away. At night, the sky above a flat rural field is open, allowing heat to radiate freely into space. Above a city block, the surrounding structures act like the walls of a kiln, re-radiating heat back down.\n\nNone of this is the same thing as global climate change. The urban heat island is a local phenomenon driven by surface materials, city layout, and waste heat from engines and air conditioners. Climate change is a planetary shift in the composition of the atmosphere. The two are connected, though: a warmer baseline climate makes every degree of local heating more dangerous, and heat islands can make it harder for residents to notice or attribute the broader warming to its true cause.\n\nWhat can be done is a mix of practical and political. City planners can mandate or incentivize green roofs, which replace heat-absorbing tar with living vegetation that cools through evaporation. They can expand tree canopy along streets, where trees provide shade during the day and continue releasing moisture at night. Lighter-colored pavements and roofs reflect more sunlight rather than absorbing it, though this has a trade-off: the reflected energy doesn't vanish, it simply moves to surrounding areas, and in dense neighborhoods the benefit can be modest.\n\nResidents have smaller but real levers. Planting a tree in a yard, choosing a lighter-colored roof, or simply reducing the waste heat from an inefficient air conditioner all contribute. The limits are obvious: a single household's choices won't cool a neighborhood, and in arid cities, the water needed to keep trees and green roofs alive may be scarcer than the shade they provide.\n\nThe deepest trade-off is structural. Cities exist because density is efficient—less commuting, less land consumed, lower per-capita emissions. Spreading people out to reduce heat would likely increase the very emissions that drive climate change. The goal, then, is not to make cities less dense but to make them cooler within their existing footprint: more green, more reflective, more breathable. The heat island won't disappear, but it can be made less severe, and that difference matters most on the nights when the air should be cooling but isn't.","finish_reason":"stop","seconds":160.1710360830184,"tokens":5532,"decode_tps":null,"client_tps":34.53807963839794,"quality_score":86.0,"dimension_scores":{"factual_accuracy":4,"clarity_explanation":5,"organization_flow":4,"concrete_useful_detail":4,"natural_voice":4,"brief_compliance":5},"factual_errors":[{"severity":"moderate","quote":"the reflected energy doesn't vanish, it simply moves to surrounding areas","explanation":"Reflection can increase exposure to nearby people or facades, especially with pavements, but solar radiation can also escape upward. The blanket formulation misleadingly implies cool surfaces only relocate heat locally."},{"severity":"minor","quote":"Climate change is a planetary shift in the composition of the atmosphere.","explanation":"Atmospheric composition change is an important driver of current warming, not a definition of climate change itself."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud27b64k","condition":"Qwen3.8 27B BF16 / OpenRouter DeepInfra budget64k","task":"data_to_report","final_text":"\n\nMEMO\n\nTo: Operations Manager\nFrom: Data Analyst\nRe: Checkout Change — Conversion Analysis\n\n**Conversion Rates**\n\n| Period | Desktop | Mobile | Overall |\n|--------|---------|--------|---------|\n| A | 20.0% | 10.0% | 11.0% |\n| B | 18.0% | 9.0% | 13.5% |\n\nOverall conversion rose from 11.0% to 13.5%, but conversion fell on both devices: desktop dropped from 20% to 18%, and mobile from 10% to 9%.\n\n**Why the Overall Rate Rose**\n\nThe increase is driven entirely by a shift in traffic mix. Period A was 90% mobile and 10% desktop; Period B was 50/50. Because desktop converts at roughly twice the mobile rate, a larger desktop share mechanically lifts the blended figure even though each device performed worse. This is a classic instance of Simpson's paradox.\n\n**What Can and Cannot Be Concluded**\n\nWe cannot attribute the overall gain to the new checkout. Two confounds prevent causal claims: (1) the marketing team changed its advertising mix between periods, which likely altered the device composition of incoming traffic, and (2) there was no randomized experiment or held-out control group. The device-level declines are consistent with the new checkout underperforming, but they are also consistent with a shift in audience quality or intent. Without a controlled comparison, we cannot separate the checkout effect from the traffic-mix effect.\n\n**Assessment of the Sales Director's Claim**\n\nThe claim that \"overall conversion went up, so the new checkout must be better\" is not supported. The overall increase is an artifact of composition change, not evidence of improved checkout performance.\n\n**Recommended Next Step**\n\nRun a randomized A/B test: split incoming traffic (within each device) between the old and new checkout while holding the advertising mix constant. This isolates the checkout effect and yields a defensible decision.","finish_reason":"stop","seconds":103.94359720894136,"tokens":4684,"decode_tps":null,"client_tps":45.06290070550951,"quality_score":82.0,"dimension_scores":{"numerical_accuracy":5,"interpretation_causal_caution":4,"decision_usefulness":4,"clarity_natural_prose":3,"brief_compliance":5},"factual_errors":[{"severity":"minor","quote":"which likely altered the device composition of incoming traffic","explanation":"Advertising mix and device composition both changed, but the supplied data do not establish that the first caused the second. This is a plausible hypothesis, marked likely, rather than an observed finding."}],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"cloud27b64k","condition":"Qwen3.8 27B BF16 / OpenRouter DeepInfra budget64k","task":"editorial_rewrite","final_text":"\n\n**Subject:** Update on the optional document search beta\n\nHi,\n\nA quick update on the optional document search beta we've been working on.\n\nThe current search remains fully available and unchanged. The beta is a separate, opt-in feature—no one needs to switch, and there is nothing to do today. We will email you with instructions when the beta is ready to enable.\n\nOur internal testing (50 document-search queries) showed a median of 5 seconds on the beta versus 7 seconds on the current service. That is a small internal test, not a customer study, so we can't promise every user will see that improvement.\n\nOne known difference: the beta can miss newly uploaded documents for up to 15 minutes after upload. The current search does not have that delay. Neither version deletes or modifies your documents.\n\nThe beta costs nothing extra while it is in beta. Pricing after the beta period has not been decided.\n\nWe are targeting October 14 for the beta to be ready, but quality assurance has not yet signed off, so we can't confirm that date. We'll let you know as soon as it is.\n\nAnyone who opts in can return to the current search at any time.\n\nThanks","finish_reason":"stop","seconds":84.1814478749875,"tokens":3706,"decode_tps":null,"client_tps":44.0239517560157,"quality_score":92.0,"dimension_scores":{"factual_preservation":5,"reader_usefulness":5,"tone_natural_prose":4,"organization_concision":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, shuffled identity labels, prior context; not fully blinded or human evaluation"},{"condition_id":"custom","condition":"Custom Flash Q4g32 + Q8 / native MTPLX medium MTP D3","task":"source_summary","final_text":"Westhaven appointment-reminder pilot\n\nThe pilot tested an appointment-reminder system for computer-help appointments at four of twelve Westhaven branches for six weeks, from 6 July to 16 August 2026. During the pilot, those branches recorded 600 bookings and 90 missed appointments, compared with 500 bookings and 100 missed appointments in the six weeks before. The missed-appointment rate fell from 20% to 15%, a five-percentage-point drop, while bookings rose by 20%. These are descriptive comparisons, not proof that the software caused the changes.\n\nThe evidence has limits. The four branches volunteered rather than being randomly selected, and the other eight branches were not measured. Staff also changed reminder wording during the pilot, and seasonal demand may have affected results, so the team cannot separate the effects of the software, wording, seasonality, or branch selection. A survey of 80 invited users received 40 responses: 28 preferred the new reminder, eight had no preference, and four preferred the old one. These describe respondents, not all users. Staff said reminders were easier to manage, but staff time was not measured. Reminder-delivery failure data were incomplete, and no accessibility assessment was completed.\n\nCosts were EUR 6,000 for the pilot: EUR 4,000 setup and EUR 2,000 for the six-week subscription. The supplier quoted EUR 12,000 per year for twelve branches, excluding staff training. There is no training estimate or net-savings calculation, and setup and annual fee should not be treated as the same cost or simply annualized together.\n\nNext, the service manager recommended an eight-week follow-up at the same branches with a complete delivery log, measured staff time, and accessibility review. The board has not approved it or a wider rollout; its next meeting is 3 September.","finish_reason":"stop","seconds":181.65907708300006,"tokens":5961,"decode_tps":33.40669718548161,"quality_score":93.0,"dimension_scores":{"factual_faithfulness":5,"decision_relevant_coverage":5,"clarity_organization":4,"natural_prose":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, model identity known; not blind or human evaluation","timing_caveat":"Elevated memory pressure, swap reads, compression/decompression observed; magnitude of slowdown not isolated"},{"condition_id":"custom","condition":"Custom Flash Q4g32 + Q8 / native MTPLX medium MTP D3","task":"knowledge_explainer","final_text":"","finish_reason":"length","seconds":2009.934085625,"tokens":64000,"decode_tps":31.86162935719055,"quality_score":null,"dimension_scores":null,"factual_errors":[],"review_method":"Single assistant, model identity known; not blind or human evaluation","timing_caveat":"Elevated memory pressure, swap reads, compression/decompression observed; magnitude of slowdown not isolated"},{"condition_id":"custom","condition":"Custom Flash Q4g32 + Q8 / native MTPLX medium MTP D3","task":"data_to_report","final_text":"Decision memo: Checkout change assessment\n\nPeriod A conversion rates were 20% on desktop (200 orders / 1,000 visits), 10% on mobile (900 / 9,000), and 11% overall (1,100 / 10,000). Period B rates were 18% on desktop (900 / 5,000), 9% on mobile (450 / 5,000), and 13.5% overall (1,350 / 10,000). Overall conversion increased by 2.5 percentage points, but both device-specific rates decreased: desktop by 2 points and mobile by 1 point.\n\nThe sales director’s claim that “overall conversion went up, so the new checkout must be better” is not supported. The overall increase is explained by a change in traffic mix: Period A was 90% mobile, while Period B was 50% desktop. Because desktop converted at a higher rate than mobile in both periods, shifting visits toward desktop raised the blended rate even though each device performed worse. The advertising mix also changed, and there was no randomized experiment or unchanged control group, so we cannot isolate the checkout change from advertising, traffic composition, or other period effects. We also cannot conclude revenue, profit, returning-customer, acquisition-cost, or source-level impacts because those measurements were not provided.\n\nRecommendation: run a randomized A/B test or holdout experiment with comparable traffic, segmenting by device and advertising source, and track orders plus revenue/profit and acquisition cost. Until then, treat the observed overall increase as descriptive, not causal. The safer operational conclusion is that the checkout change did not improve conversion on either device and may have harmed it, while the blended metric improved only because of mix shift.","finish_reason":"stop","seconds":85.97621120799977,"tokens":2597,"decode_tps":30.500007844837867,"quality_score":80.0,"dimension_scores":{"numerical_accuracy":5,"interpretation_causal_caution":3,"decision_usefulness":4,"clarity_natural_prose":4,"brief_compliance":5},"factual_errors":[{"severity":"moderate","quote":"The safer operational conclusion is that the checkout change did not improve conversion on either device and may have harmed it","explanation":"Observed device-level conversion declined, but these nonrandomized before/after data do not establish whether the checkout change improved, worsened or left conversion unchanged relative to what would otherwise have happened. Replace with 'Conversion declined within both device groups; the checkout change's causal effect remains unknown.'"}],"review_method":"Single assistant, model identity known; not blind or human evaluation","timing_caveat":"Elevated memory pressure, swap reads, compression/decompression observed; magnitude of slowdown not isolated"},{"condition_id":"custom","condition":"Custom Flash Q4g32 + Q8 / native MTPLX medium MTP D3","task":"editorial_rewrite","final_text":"Subject: Update on the optional document search beta\n\nYou are enrolled in the beta program, but this new document search beta is optional. It is not a replacement for the current search. You can continue using the existing service, and no one needs to switch.\n\nEngineering is targeting October 14 for enabling the beta, but QA has not signed it off yet, so that date is not final. In internal testing, the same 50 document-search queries took a median of 7 seconds on the current service and 5 seconds on the beta. This was not a customer study, so it does not show that every customer will see that improvement. The test involved 50 queries, not 50 people.\n\nBeta searches can sometimes miss newly uploaded documents for up to 15 minutes. The current search does not have that known delay. Neither search deletes or modifies your documents.\n\nThere is nothing to do today. We will email you when the beta is ready with instructions for opting in. If you opt in, you can return to the current search at any time. The beta costs nothing extra during the beta; pricing afterward has not been decided.","finish_reason":"stop","seconds":125.37755849999985,"tokens":4184,"decode_tps":33.644224854317805,"quality_score":92.0,"dimension_scores":{"factual_preservation":5,"reader_usefulness":5,"tone_natural_prose":4,"organization_concision":4,"brief_compliance":5},"factual_errors":[],"review_method":"Single assistant, model identity known; not blind or human evaluation","timing_caveat":"Elevated memory pressure, swap reads, compression/decompression observed; magnitude of slowdown not isolated"}]