{
 "entity": "claude-opus-4-8",
 "entity_type": "model",
 "category": "Study notes",
 "suite": "suite-2026-08-tasks2/study-notes",
 "model": "anthropic/claude-opus-4.8",
 "judges": [
  "google/gemini-3.1-pro-preview",
  "openai/gpt-5.6-terra",
  "x-ai/grok-4.5"
 ],
 "judge_protocol": "judge-2026-08",
 "anchors": "solo-2026-08-a",
 "score": 85,
 "caps": 9,
 "cost_usd": 0.2389,
 "started_at": "2026-08-14T13:13:28.032Z",
 "finished_at": "2026-08-14T13:14:07.608Z",
 "tasks": [
  {
   "id": "st1",
   "name": "Condense a topic",
   "prompt": "Make revision notes on photosynthesis for GCSE level: maximum 10 bullet points, each under 15 words, must include the word equation, no sub-bullets.",
   "output": "# Photosynthesis Revision Notes (GCSE)\n\n- Photosynthesis occurs in chloroplasts containing chlorophyll, which absorbs light energy.\n\n- Word equation: carbon dioxide + water → glucose + oxygen (using light energy).\n\n- It is an endothermic reaction because energy is transferred from the surroundings.\n\n- Plants use glucose for respiration, making cellulose, proteins, and storing as starch.\n\n- Limiting factors: light intensity, carbon dioxide concentration, and temperature.\n\n- Increasing light intensity increases rate until another factor becomes limiting.\n\n- Too high temperature denatures enzymes, stopping photosynthesis completely.\n\n- Leaves are broad and flat to absorb maximum sunlight.\n\n- Stomata allow carbon dioxide in and oxygen out via diffusion.\n\n- Test for starch using iodine, which turns blue-black if present.",
   "latency_ms": 5115,
   "cost": 0.007895,
   "task_score": 10,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly follows all instructions, including the maximum of 10 bullet points, word count limits per bullet, inclusion of the word equation, and no sub-bullets. Content is accurate and highly useful for GCSE revision."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 8,
     "violates": false,
     "reasoning": "Meets all explicit constraints: 10 bullets, each under 15 words, no sub-bullets, and includes the word equation. Clear and GCSE-appropriate. Minor oversimplifications: protein production requires nitrates, and high temperature may not alway"
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 10,
     "violates": false,
     "reasoning": "Meets all constraints exactly; accurate GCSE content; clear, concise, fully useful notes."
    }
   ]
  },
  {
   "id": "st2",
   "name": "Flashcards that test",
   "prompt": "Write 6 flashcards (Q on one line, A on the next) on the causes of World War One. Questions must be answerable from memory — no 'discuss', no multi-part questions, answers under 20 words each.",
   "output": "**Q: Which alliance system bound Germany, Austria-Hungary, and Italy together before WWI?**\nA: The Triple Alliance.\n\n**Q: What event in June 1914 triggered the outbreak of World War One?**\nA: The assassination of Archduke Franz Ferdinand in Sarajevo.\n\n**Q: Which naval arms race heightened tensions between Britain and Germany?**\nA: The competition to build dreadnought battleships.\n\n**Q: What term describes the intense national pride that fueled pre-war rivalries?**\nA: Nationalism.\n\n**Q: Which country did Austria-Hungary blame and issue an ultimatum to after the assassination?**\nA: Serbia.\n\n**Q: Which German war plan aimed to defeat France quickly before fighting Russia?**\nA: The Schlieffen Plan.",
   "latency_ms": 4415,
   "cost": 0.00731,
   "task_score": 10,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly follows all instructions, providing 6 accurate, concise flashcards with single-part questions and answers well under the 20-word limit. The formatting is correct and highly useful."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 9,
     "violates": false,
     "reasoning": "All six flashcards meet the format and answer-length requirements. Content is accurate, concise, and covers major causes. Minor simplification: the assassination triggered the crisis rather than directly causing war alone."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 10,
     "violates": false,
     "reasoning": "Perfect format, 6 valid memory flashcards, all answers under 20 words, fully on-topic causes of WWI."
    }
   ]
  },
  {
   "id": "st3",
   "name": "Explain then check",
   "prompt": "Explain osmosis to a 14-year-old in under 80 words, then write ONE question that would reveal whether they actually understood it (not vocabulary recall).",
   "output": "**Osmosis:** Imagine water molecules can squeeze through a filter, but bigger stuff (like salt or sugar) can't. Osmosis is water naturally moving through that filter toward the side with more dissolved stuff—like water trying to \"balance out\" both sides. It keeps moving until things are even, or as even as they can get. Your cells do this constantly to stay healthy.\n\n**Question:** If you put a limp piece of celery in plain water, what would happen to it—and why?",
   "latency_ms": 3958,
   "cost": 0.004235,
   "task_score": 10,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The explanation is accurate, age-appropriate, and well under the 80-word limit. The follow-up question perfectly tests conceptual understanding rather than rote memorization."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 8,
     "violates": false,
     "reasoning": "Clear, age-appropriate, and under 80 words. The celery question tests application rather than recall. Minor simplification: osmosis reaches water-potential equilibrium, not necessarily equal amounts of dissolved substances on both sides."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 10,
     "violates": false,
     "reasoning": "Accurate kid-friendly osmosis explanation under 80 words; insightful application question tests real understanding."
    }
   ]
  },
  {
   "id": "st4",
   "name": "The exam answer plan",
   "prompt": "Plan a 12-mark GCSE history answer on 'How far was the Treaty of Versailles responsible for the rise of Hitler?' Give: a one-line judgement, 3 paragraph topics (one line each), and what the counter-paragraph concedes. No essay, just the plan, under 120 words.",
   "output": "# Essay Plan: Treaty of Versailles & Rise of Hitler\n\n**Judgement:** The Treaty was a significant long-term cause, but the Depression was the crucial trigger that made Hitler's rise possible.\n\n**Paragraph 1 (Versailles):** War Guilt, reparations and \"stab in the back\" myth fuelled resentment Hitler exploited in propaganda.\n\n**Paragraph 2 (Economic factors):** The 1929 Depression caused mass unemployment, driving desperate voters to Nazi extremism.\n\n**Paragraph 3 (Political factors):** Weimar's weaknesses, proportional representation and elite backing (Von Papen) handed Hitler power in 1933.\n\n**Counter-paragraph concedes:** Versailles alone didn't cause the rise—the Nazis were unpopular in the mid-1920s (only 12 seats in 1928) and only surged after the Depression hit, showing Versailles needed a trigger.",
   "latency_ms": 5464,
   "cost": 0.008655,
   "task_score": 10,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly follows all instructions, including the strict word count (111 words). The historical content is highly accurate for a GCSE level, and the formatting is clear, concise, and directly addresses the prompt."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 10,
     "violates": false,
     "reasoning": "Meets all requested elements in a concise plan under 120 words. It gives a clear balanced judgement, three relevant paragraph topics with supporting detail, and a precise counter-concession. Historical claims are accurate and useful for a 1"
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 5,
     "violates": true,
     "reasoning": "Solid accurate plan matching all required elements exactly; clear and useful. Minor excess over 120 words."
    }
   ]
  },
  {
   "id": "st5",
   "name": "Mnemonic that works",
   "prompt": "Create a mnemonic for the order of operations (brackets, indices, division/multiplication, addition/subtraction) that is NOT 'BIDMAS/BODMAS' spelled out, plus one sentence on when the D/M order actually matters.",
   "output": "# Mnemonic\n\n**\"Big Iguanas Digest Meals Alphabetically Sometimes\"**\n\n- **B**ig → **B**rackets\n- **I**guanas → **I**ndices\n- **D**igest → **D**ivision\n- **M**eals → **M**ultiplication\n- **A**lphabetically → **A**ddition\n- **S**ometimes → **S**ubtraction\n\n*(Remembering that Division/Multiplication share a level, as do Addition/Subtraction.)*\n\n# When D/M Order Actually Matters\n\nThe Division/Multiplication order matters when they appear together without brackets, because you must work **left to right** rather than always doing division or multiplication first—for example, in `8 ÷ 2 × 4`, working left to right gives `4 × 4 = 16`, whereas wrongly doing multiplication first gives `8 ÷ 8 = 1`.",
   "latency_ms": 6165,
   "cost": 0.00778,
   "task_score": 9,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response provides a creative mnemonic sentence that doesn't just spell out the acronym, and accurately explains the left-to-right rule for division and multiplication in exactly one sentence."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 3,
     "violates": true,
     "reasoning": "The D/M explanation is accurate and clear, but the mnemonic’s initials spell BIDMAS exactly, directly violating the requirement not to use BIDMAS/BODMAS spelled out. It therefore misses the task’s central constraint."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 9,
     "violates": false,
     "reasoning": "Accurate mnemonic and left-to-right rule with clear example. Fully follows task; highly usable and concise for non-experts."
    }
   ]
  },
  {
   "id": "st6",
   "name": "Spot the misconception",
   "prompt": "A student writes: 'Heavier objects fall faster, that's why a hammer hits the ground before a feather.' In under 90 words, correct the misconception without jargon, keeping the part of their intuition that is right.",
   "output": "Your intuition isn't wrong—a hammer really does beat a feather in everyday life. But the reason isn't weight; it's air. The feather gets pushed around and slowed by the air it has to move through, while the hammer barely notices it. Remove the air, and they hit the ground at the exact same time. So gravity pulls on everything equally fast; what you're actually seeing is air getting in the feather's way, not the hammer being heavier.",
   "latency_ms": 3821,
   "cost": 0.00392,
   "task_score": 10,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly corrects the misconception without jargon, validates the student's correct intuition, and stays well under the 90-word limit."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 9,
     "violates": false,
     "reasoning": "Clear, accurate correction that preserves the student's everyday observation and explains air resistance without jargon. Minor oversimplification: gravity’s pull is not literally equal in force, but objects accelerate equally without air."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 10,
     "violates": false,
     "reasoning": "Accurate correction of air resistance vs. gravity; keeps valid intuition; under 90 words, no jargon, clear and useful."
    }
   ]
  },
  {
   "id": "st7",
   "name": "Timetable the revision",
   "prompt": "A student has 3 exams (Maths 12 June, Biology 16 June, French 17 June), revises 2 hours on weekdays and 4 at weekends, starting 1 June. Produce a simple day-by-day allocation as a list, weighting the earliest exam first, with every day accounted for through 17 June.",
   "output": "# Revision Timetable: 1–17 June\n\n**Rules applied:** 2 hrs weekdays, 4 hrs weekends. Earliest exam prioritised, then shifting focus to the next as each exam passes.\n\n*(Assuming 1 June is a Saturday — adjust days if your calendar differs)*\n\n| Date | Day | Hours | Subject Allocation |\n|------|-----|-------|--------------------|\n| 1 Jun | Sat | 4 | Maths (4) |\n| 2 Jun | Sun | 4 | Maths (4) |\n| 3 Jun | Mon | 2 | Maths (2) |\n| 4 Jun | Tue | 2 | Maths (2) |\n| 5 Jun | Wed | 2 | Maths (2) |\n| 6 Jun | Thu | 2 | Maths (2) |\n| 7 Jun | Fri | 2 | Maths (2) |\n| 8 Jun | Sat | 4 | Maths (3) + Biology (1) |\n| 9 Jun | Sun | 4 | Maths (3) + Biology (1) |\n| 10 Jun | Mon | 2 | Maths (2) |\n| 11 Jun | Tue | 2 | Maths (2) |\n| **12 Jun** | **Wed** | — | **MATHS EXAM** |\n| 13 Jun | Thu | 2 | Biology (2) |\n| 14 Jun | Fri | 2 | Biology (1) + French (1) |\n| 15 Jun | Sat | 4 | Biology (3) + French (1) |\n| **16 Jun** | **Sun** | — | **BIOLOGY EXAM** |\n| **17 Jun** | **Mon** | — | **FRENCH EXAM** |\n\n---\n\n### Notes\n- **Maths gets the heaviest early load** as it's first, with a little Biology mixed in on weekends before the exam.\n- After 12 June, focus **switches fully to Biology**, then a final French push on 15 June.\n- **French is lightest** — consider adding a short revision block on the evenings of 16 June (after the Biology exam) if energy allows.\n- If your calendar dates fall on different weekdays, simply reassign the 2 hr / 4 hr values to match actual weekdays/weekends.\n\nWould you like a version that gives French more time, or one built around a specific start weekday?",
   "latency_ms": 9121,
   "cost": 0.02026,
   "task_score": 5,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 5,
     "violates": true,
     "reasoning": "The prompt requested the allocation 'as a list', but the response provided a markdown table instead. Otherwise, it is a strong, clear, and accurate schedule."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 5,
     "violates": true,
     "reasoning": "It accounts for all dates, but does not allocate the required 2/4 revision hours on 12, 16, or 17 June. French also receives only two hours before its exam, limiting usefulness."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 5,
     "violates": true,
     "reasoning": "Solid allocation weighting Maths first and covering all days, but presented as table not required list; minor calendar assumption."
    }
   ]
  },
  {
   "id": "st8",
   "name": "Simplify without losing truth",
   "prompt": "Rewrite for a 12-year-old in under 60 words without making it false: 'Enzymes are biological catalysts that lower the activation energy of reactions by providing an alternative reaction pathway, and are highly specific due to the complementary shape of their active site.'",
   "output": "Enzymes are special proteins that speed up chemical reactions in living things. They work by making reactions easier to start, so they need less energy. Each enzyme has a specially shaped part called the active site that fits only certain molecules—like a lock and key—which is why enzymes only work on specific reactions.",
   "latency_ms": 3589,
   "cost": 0.00285,
   "task_score": 9,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly simplifies the concept for a 12-year-old, maintains factual accuracy, and strictly adheres to the under 60 words constraint (54 words)."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 8,
     "violates": false,
     "reasoning": "Clear, age-appropriate, and 54 words. It accurately explains lowered activation energy and active-site specificity. Minor technical oversimplification: not all enzymes are proteins, and “fits only” is more absolute than real enzyme specific"
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 9,
     "violates": false,
     "reasoning": "Accurate simplification for age group; 52 words; captures key ideas without falsity; clear and useful."
    }
   ]
  },
  {
   "id": "st9",
   "name": "Quiz from notes",
   "prompt": "From this note, write 4 quiz questions with answers, at least one requiring application rather than recall: 'Supply and demand: when price rises, quantity demanded falls (movement along the curve). A shift of the whole demand curve is caused by income, tastes, substitutes, population.'",
   "output": "# Quiz: Supply and Demand\n\n**Question 1 (Recall)**\nWhat happens to quantity demanded when the price of a good rises?\n\n**Answer:** Quantity demanded falls. This is represented as a movement *along* the demand curve (not a shift of the curve).\n\n---\n\n**Question 2 (Recall)**\nList the four factors mentioned that cause the entire demand curve to shift.\n\n**Answer:** Income, tastes, substitutes, and population.\n\n---\n\n**Question 3 (Application)**\nA popular coffee chain notices that sales of its coffee dropped after a competitor opened nearby and lowered its prices. Is this a movement along the demand curve or a shift of the demand curve? Explain.\n\n**Answer:** This is a **shift** of the demand curve. The change was caused by a substitute (the competitor's cheaper coffee), which is one of the factors that shifts the whole curve—not a change in the chain's own price, which would cause a movement along the curve.\n\n---\n\n**Question 4 (Application)**\nA city's population grows rapidly over five years, and at the same time average incomes rise. Predict what happens to the demand curve for restaurant meals, and explain which concept applies.\n\n**Answer:** The demand curve for restaurant meals will **shift to the right** (increase in demand). Both population growth and rising income are factors that shift the entire demand curve outward, meaning more meals are demanded at every price level.",
   "latency_ms": 7189,
   "cost": 0.012025,
   "task_score": 9,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly follows all instructions, providing exactly 4 quiz questions with answers based on the text, including two excellent application questions. It is clear, concise, and highly useful."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 8,
     "violates": false,
     "reasoning": "Provides exactly four clear questions with answers and two application items. Correctly distinguishes movements from shifts. Minor issue: rising income does not necessarily increase demand for every good; the rightward shift assumes restaur"
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 9,
     "violates": false,
     "reasoning": "Accurate questions and answers covering the note; two solid application items; clear format; minor extra labeling not required but harmless."
    }
   ]
  },
  {
   "id": "st10",
   "name": "Compare for the exam",
   "prompt": "Make a two-column comparison (markdown table, max 6 rows) of mitosis vs meiosis a GCSE student could memorise: chromosome number, divisions, daughter cells, variation, where it happens, purpose.",
   "output": "| Feature | Mitosis | Meiosis |\n|---|---|---|\n| Chromosome number | Stays the same (diploid → diploid) | Halves (diploid → haploid) |\n| Divisions | 1 division | 2 divisions |\n| Daughter cells | 2 cells, genetically identical | 4 cells, genetically different |\n| Variation | No variation (clones) | Creates variation |\n| Where it happens | All body cells | Reproductive organs (ovaries/testes) |\n| Purpose | Growth and repair | Making gametes (sex cells) |",
   "latency_ms": 3099,
   "cost": 0.005165,
   "task_score": 5,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 5,
     "violates": true,
     "reasoning": "The response is accurate, clear, and perfectly tailored for a GCSE student. However, it violates the constraint by providing a three-column table instead of a two-column table."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 5,
     "violates": true,
     "reasoning": "Accurate, concise GCSE-level comparison covering all requested topics. Minor oversimplification: mitosis does not occur in literally all body cells. It breaks explicit format constraints: the table has three columns and seven rows including"
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 10,
     "violates": false,
     "reasoning": "Exact match to required features in clear 6-row markdown table; fully accurate and memorable for GCSE."
    }
   ]
  },
  {
   "id": "st11",
   "name": "The night-before triage",
   "prompt": "A student has one evening before a biology exam and hasn't revised topics: cells, enzymes, digestion, respiration, photosynthesis. In under 100 words, give a triage plan for 3 hours — what gets time, what gets skimmed, and the one thing NOT to do.",
   "output": "**Triage Plan (3 hours)**\n\n**Deep focus (2 hrs):** Enzymes and respiration—these are high-yield, interlinked, and often carry the trickiest marks. Enzymes underpin digestion and photosynthesis too, so mastering them pays off across topics.\n\n**Skim (45 min):** Cells (know structures/functions) and photosynthesis (basic equation, stages). Learn key terms and diagrams, not every detail.\n\n**Quick pass (15 min):** Digestion—link it to enzymes you already studied.\n\n**Do NOT:** Try to master everything equally or read passively. Don't pull an all-nighter—sleep consolidates memory. Prioritise ruthlessly.",
   "latency_ms": 4650,
   "cost": 0.006425,
   "task_score": 5,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 5,
     "violates": true,
     "reasoning": "The response is under 100 words and provides a solid 3-hour triage plan. However, it violates the constraint to provide 'the one thing NOT to do' by listing multiple things to avoid."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 5,
     "violates": true,
     "reasoning": "Clear, practical 3-hour allocation and broadly sound prioritisation. However, it gives several “Do NOT” actions despite requesting one, and digestion is arguably oversimplified as a 15-minute enzyme link."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 9,
     "violates": false,
     "reasoning": "Accurate triage prioritizing high-yield topics; under 100 words; clear structure and useful advice for non-expert. Minor polish only."
    }
   ]
  },
  {
   "id": "st12",
   "name": "Refuse to do the homework",
   "prompt": "A student pastes an essay question and says 'write this so I can hand it in'. Respond in under 80 words: decline to write a submittable essay, and offer the two most useful things you WILL do instead.",
   "output": "I can't write an essay for you to hand in as your own—that's academic dishonesty and could get you in real trouble.\n\nHere's what I'll gladly do instead:\n\n1. **Help you build an outline**—key arguments, structure, and evidence to include.\n2. **Review a draft you write**—giving feedback on clarity, logic, and where to strengthen it.\n\nWant to start with either one? Paste the question and let's dig in.",
   "latency_ms": 3213,
   "cost": 0.003765,
   "task_score": 10,
   "judges": [
    {
     "judge": "google/gemini-3.1-pro-preview",
     "score": 10,
     "violates": false,
     "reasoning": "The response perfectly follows all instructions. It declines the request, offers two highly practical alternatives, and stays well under the 80-word limit (70 words). It is clear, professional, and directly addresses the prompt."
    },
    {
     "judge": "openai/gpt-5.6-terra",
     "score": 10,
     "violates": false,
     "reasoning": "Clearly declines to produce a submittable essay, explains why, and offers exactly two highly useful alternatives: outlining and draft feedback. It is concise, professional, actionable, and well under 80 words."
    },
    {
     "judge": "x-ai/grok-4.5",
     "score": 10,
     "violates": false,
     "reasoning": "Meets word limit, declines essay writing, offers two useful alternatives clearly and accurately."
    }
   ]
  }
 ]
}