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GPT-6.1 Sol (effort default (no reasoning-effort override) · thinking off) on Animate a row of pendulums, each swinging at its own true period, in one self-contained HTML file

OGPT-6.1 Soldefault · thinking off · Codex CLI 0.163.0 (codex exec --json) · cloud · 2026-10-23 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first try
Estimated cost
$0.03
Wall time
28s
Human step-ins
0
Outcome
Pass

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Summary

Exact prompt

# Animate a row of pendulums, each swinging at its own true period, in one self-contained HTML file Make a small animated scene: a pendulum wave. Write one file, `out/scene.html`, that works opened straight from disk with no network access. `spec.json` gives the page title, the stage size and the scene parameters. **Looks are not scored**: the page is opened in a headless browser (800x600 window, UTC time zone, network blocked) and checked by objective tests only. ## Scene contract - Draw the scene on one `<canvas>` or `<svg>` stage of `width` x `height` CSS pixels (spec.json), visible on load, with `<title>` containing spec.json `title`. - Animate continuously from load (`requestAnimationFrame` or timers); no click is needed unless stated below. - Expose `window.sceneState()`, returning the scene's current state in stage pixel coordinates (origin top-left of the stage): `{pendulums: [{name, angle_deg, pivot: {x, y}, bob: {x, y}}, ...]}`. Extra fields are fine. It must describe what is actually drawn. - Each pendulum in spec.json has a `length_m`. Its period T is the time for one full back-and-forth swing of an ideal small-angle pendulum of that length under `gravity` (m/s²); every pendulum swings with the same amplitude `amplitude_deg`. `sceneState()` must return the state at the moment it is called (work it out from `performance.now()`, don't return the last frame's numbers). - The page must log no errors and throw no exceptions. Keep the file at most 200,000 bytes; no external scripts, fonts, images or URLs (inline everything). ## Checks (partial credit = share passed) 1. `self_contained`: `out/scene.html` exists, is at most 200,000 bytes, references no http(s) or protocol-relative URL, and requests nothing from the network when opened. 2. `has_canvas_or_svg`: a visible `<canvas>` or `<svg>` of at least 300x200 CSS pixels is on the page. 3. `frames_change`: over 3 s, some later screenshot differs from the first in at least 0.1% of pixels, and at least 3 of 30 screenshots differ. 4. `swing_periods`: `sceneState().pendulums` names exactly the pendulums in spec.json, and over 3 s each pendulum's `angle_deg` stays within 2.5° of `amplitude_deg` × cos(2π t / T + φ) for some fixed φ, where t is `performance.now()` in seconds and T is the pendulum's period. 5. `bobs_on_strings`: in every sample, each bob is within 3 px of pivot + `length_m` × `px_per_m` × (sin θ, cos θ), θ = `angle_deg` (positive swings the bob to the right of the pivot, y grows downwards). 6. `no_console_errors`: no uncaught exception, `console.error` or browser error is logged during the run. ## How this run works - Work on your own: nobody will answer questions in this task, and writing to `ask/` counts against the run. - Write only under `out/`. Create `out/` if it is missing. Inputs are synthetic; don't fetch anything from the network. - Scoring is partial credit: each listed check is pass/fail, and the score is the share passed. Numbers are compared to within 0.005 unless the task says otherwise.

Original benchmark task written for usecaserank.com. Headless, offline run on a reproducible fixture. Cost shown is a list-price API-equivalent estimate (run on a ChatGPT subscription, not billed).

Success criteria: self_contained has_canvas_or_svg frames_change swing_periods bobs_on_strings no_console_errors

Setup notes: batch29 case h07-pendulum-wave (offline fixture). Prepared with batch29/prepare.sh on the shared box; only TASK.md + starting files were copied to the agent machine, hidden key/tests stayed on the box. Prompt = TASK.md verbatim on stdin. Flags: --json -s workspace-write --skip-git-repo-check --ephemeral --ignore-user-config --ignore-rules -C <workdir>. Scored on the box with the scout's scorer: `MEDIA_DIR=<dir> python3 score.py WORKDIR KEYDIR`. Single run, no retries. User-level AGENTS.md (846 bytes, sha256 83ec4fe50da8) may have been in context; --ignore-user-config does not document excluding it. Autonomous case (seed 2944328201): no stand-in user; any ask/ file counts as an intervention and blocks a pass. Serving model not confirmed: requested via -m; the event log does not echo the serving model id. Price source is secondary (pricing.json verification='secondary', https://www.actuia.com/en/news/ai-api-pricing-in-october-2026-050-to-50-for-output/), not an official OpenAI price page. Score: 6/6. Cost is an ESTIMATE: measured tokens x pricing.json list price (ChatGPT plan, nothing billed); input_tokens include cached reads; output_tokens include reasoning tokens. Tool calls 4 (1 failed, recovered). Single run.

Estimated cost List-price estimate; not actually billed.

Output

Metrics

Estimated cost
$0.03
Wall time
28s
Human step-ins
0
Turns
1
Model usage
ModelInput tokOutput tokCost
OGPT-6.1 Solopenai/gpt-6.1-soleffort default (no reasoning-effort override) · thinking off81,5171,386$0.03

Reproduce this run

  1. Use the use case prompt on the use case page.
  2. Same setup: GPT-6.1 Sol (openai/gpt-6.1-sol, effort default (no reasoning-effort override) · thinking off) via Codex CLI 0.163.0 (codex exec --json), cloud.
  3. It counts as a success only if it meets every success criterion: self_contained has_canvas_or_svg frames_change swing_periods bobs_on_strings no_console_errors
  4. Log model, tokens, wall time, human step-ins and the evidence log, then submit it as a reproduction. A different model? Submit a head-to-head rerun.

How runs are scored: Methodology.

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Automated checks

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Evidence log
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{"type": "turn.started"}
{"type": "item.completed", "item": {"id": "item_0", "type": "agent_message", "text": "I\u2019ll read `spec.json` and build the animation in `out/scene.html`, using the same time-based calculation for drawing and `sceneState()`.\n"}}
{"type": "item.started", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd && rg --files -g 'spec.json' -g 'AGENTS.md'\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
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{"type": "item.started", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat spec.json'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat spec.json'", "aggregated_output": "{\n \"title\": \"Pendulum Wave 920\",\n \"width\": 760,\n \"height\": 500,\n \"file\": \"out/scene.html\",\n \"gravity\": 9.81,\n \"amplitude_deg\": 12,\n \"px_per_m\": 320,\n \"pendulums\": [\n  {\n   \"name\": \"P1\",\n   \"length_m\": 0.65\n  },\n  {\n   \"name\": \"P2\",\n   \"length_m\": 0.55\n  },\n  {\n   \"name\": \"P3\",\n   \"length_m\": 0.5\n  },\n  {\n   \"name\": \"P4\",\n   \"length_m\": 0.45\n  },\n  {\n   \"name\": \"P5\",\n   \"length_m\": 0.25\n  }\n ]\n}", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc \"mkdir -p out\ncat > out/scene.html <<'EOF'\n<\"'!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n<title>Pendulum Wave 920</title>\n<style>\nhtml,body{margin:0;background:#101722;color:#e6edf7;font-family:system-ui,sans-serif}canvas{display:block;width:760px;height:500px;background:#172235}\n</style>\n</head>\n<body>\n<canvas id=\"stage\" width=\"760\" height=\"500\" aria-label=\"Pendulum Wave 920\"></canvas>\n<script>\n'\"'use strict';\nconst spec={title:'Pendulum Wave 920',width:760,height:500,gravity:9.81,amplitude_deg:12,px_per_m:320,pendulums:[{name:'P1',length_m:.65},{name:'P2',length_m:.55},{name:'P3',length_m:.5},{name:'P4',length_m:.45},{name:'P5',length_m:.25}]};\nconst canvas=document.getElementById('stage');\nconst ctx=canvas.getContext('2d');\nconst start=performance.now();\nconst colors=['#6ed6ff','#83e8c2','#f6d477','#f4a77c','#c2a5ff'];\nfunction stateAt(now){\n const t=(now-start)/1000;\n return {pendulums:spec.pendulums.map((p,i)=>{\n  const period=2*Math.PI*Math.sqrt(p.length_m/spec.gravity);\n  const angle_deg=spec.amplitude_deg*Math.cos(2*Math.PI*t/period);\n  const theta=angle_deg*Math.PI/180;\n  const pivot={x:100+i*140,y:130};\n  const length=p.length_m*spec.px_per_m;\n  return {name:p.name,angle_deg,pivot,bob:{x:pivot.x+length*Math.sin(theta),y:pivot.y+length*Math.cos(theta)},period_s:period};\n })};\n}\nwindow.sceneState=()=>stateAt(performance.now());\nfunction draw(){\n const state=stateAt(performance.now());\n ctx.clearRect(0,0,spec.width,spec.height);\n ctx.fillStyle='#e6edf7';ctx.font='24px system-ui';ctx.fillText(spec.title,28,44);\n ctx.fillStyle='#a3b3cb';ctx.font='14px system-ui';ctx.fillText('Independent lengths \u2022 shared amplitude',29,71);\n ctx.strokeStyle='#77869c';ctx.lineWidth=5;ctx.beginPath();ctx.moveTo(60,130);ctx.lineTo(700,130);ctx.stroke();\n state.pendulums.forEach((p,i)=>{\n  ctx.strokeStyle='#c0ccdc';ctx.lineWidth=2;ctx.beginPath();ctx.moveTo(p.pivot.x,p.pivot.y);ctx.lineTo(p.bob.x,p.bob.y);ctx.stroke();\n  ctx.fillStyle='#ecf2fa';ctx.beginPath();ctx.arc(p.pivot.x,p.pivot.y,4,0,2*Math.PI);ctx.fill();\n  ctx.fillStyle=colors[i];ctx.beginPath();ctx.arc(p.bob.x,p.bob.y,14,0,2*Math.PI);ctx.fill();\n  ctx.textAlign='center';ctx.font='14px system-ui';ctx.fillText(p.name,p.pivot.x,400);\n  ctx.fillStyle='#a3b3cb';ctx.font='12px system-ui';ctx.fillText(spec.pendulums[i].length_m+' m',p.pivot.x,422);ctx.textAlign='left';\n });\n requestAnimationFrame(draw);\n}\ndraw();\n</script>\n</body>\n</html>\nEOF\nnode --check <(sed -n '/\"'^'\"\\\\x27use strict\\\\x27;/,/\"'^<'\"\\\\/script>/p' out/scene.html | sed '\"'$d'\"')\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_3", "type": "command_execution", "command": "/bin/bash -lc \"mkdir -p out\ncat > out/scene.html <<'EOF'\n<\"'!doctype html>\n<html lang=\"en\">\n<head>\n<meta charset=\"utf-8\">\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\n<title>Pendulum Wave 920</title>\n<style>\nhtml,body{margin:0;background:#101722;color:#e6edf7;font-family:system-ui,sans-serif}canvas{display:block;width:760px;height:500px;background:#172235}\n</style>\n</head>\n<body>\n<canvas id=\"stage\" width=\"760\" height=\"500\" aria-label=\"Pendulum Wave 920\"></canvas>\n<script>\n'\"'use strict';\nconst spec={title:'Pendulum Wave 920',width:760,height:500,gravity:9.81,amplitude_deg:12,px_per_m:320,pendulums:[{name:'P1',length_m:.65},{name:'P2',length_m:.55},{name:'P3',length_m:.5},{name:'P4',length_m:.45},{name:'P5',length_m:.25}]};\nconst canvas=document.getElementById('stage');\nconst ctx=canvas.getContext('2d');\nconst start=performance.now();\nconst colors=['#6ed6ff','#83e8c2','#f6d477','#f4a77c','#c2a5ff'];\nfunction stateAt(now){\n const t=(now-start)/1000;\n return {pendulums:spec.pendulums.map((p,i)=>{\n  const period=2*Math.PI*Math.sqrt(p.length_m/spec.gravity);\n  const angle_deg=spec.amplitude_deg*Math.cos(2*Math.PI*t/period);\n  const theta=angle_deg*Math.PI/180;\n  const pivot={x:100+i*140,y:130};\n  const length=p.length_m*spec.px_per_m;\n  return {name:p.name,angle_deg,pivot,bob:{x:pivot.x+length*Math.sin(theta),y:pivot.y+length*Math.cos(theta)},period_s:period};\n })};\n}\nwindow.sceneState=()=>stateAt(performance.now());\nfunction draw(){\n const state=stateAt(performance.now());\n ctx.clearRect(0,0,spec.width,spec.height);\n ctx.fillStyle='#e6edf7';ctx.font='24px system-ui';ctx.fillText(spec.title,28,44);\n ctx.fillStyle='#a3b3cb';ctx.font='14px system-ui';ctx.fillText('Independent lengths \u2022 shared amplitude',29,71);\n ctx.strokeStyle='#77869c';ctx.lineWidth=5;ctx.beginPath();ctx.moveTo(60,130);ctx.lineTo(700,130);ctx.stroke();\n state.pendulums.forEach((p,i)=>{\n  ctx.strokeStyle='#c0ccdc';ctx.lineWidth=2;ctx.beginPath();ctx.moveTo(p.pivot.x,p.pivot.y);ctx.lineTo(p.bob.x,p.bob.y);ctx.stroke();\n  ctx.fillStyle='#ecf2fa';ctx.beginPath();ctx.arc(p.pivot.x,p.pivot.y,4,0,2*Math.PI);ctx.fill();\n  ctx.fillStyle=colors[i];ctx.beginPath();ctx.arc(p.bob.x,p.bob.y,14,0,2*Math.PI);ctx.fill();\n  ctx.textAlign='center';ctx.font='14px system-ui';ctx.fillText(p.name,p.pivot.x,400);\n  ctx.fillStyle='#a3b3cb';ctx.font='12px system-ui';ctx.fillText(spec.pendulums[i].length_m+' m',p.pivot.x,422);ctx.textAlign='left';\n });\n requestAnimationFrame(draw);\n}\ndraw();\n</script>\n</body>\n</html>\nEOF\nnode --check <(sed -n '/\"'^'\"\\\\x27use strict\\\\x27;/,/\"'^<'\"\\\\/script>/p' out/scene.html | sed '\"'$d'\"')\"", "aggregated_output": "node:fs:621\n    return binding.readFileUtf8(path, stringToFlags(options.flag));\n                   ^\n\nError: ENOENT: no such file or directory, open '/proc/2/fd/pipe:[1017692204]'\n    at Object.readFileSync (node:fs:621:20)\n    at node:internal/main/check_syntax:36:21 {\n  errno: -2,\n  code: 'ENOENT',\n  syscall: 'open',\n  path: '/proc/2/fd/pipe:[1017692204]'\n}\n\nNode.js v26.8.1\n", "exit_code": 1, "status": "failed"}}
{"type": "item.started", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"node - <<'EOF'\nconst fs=require('fs'),vm=require('vm');\nconst html=fs.readFileSync('out/scene.html','utf8');\nconst script=html.match(/<script>([\\\\s\\\\S]*?)<\\\\/script>/)[1];\nnew vm.Script(script);\nconst noop=()=>{};const ctx=new Proxy({}, {get:()=>noop,set:()=>true});\nlet now=100;\nconst sandbox={performance:{now:()=>now},document:{getElementById:()=>({getContext:()=>ctx})},window:{},requestAnimationFrame:noop};\nvm.runInNewContext(script,sandbox);\nfor(let i=0;i<31;i++){now=100+i*100;const s=sandbox.window.sceneState();if(s.pendulums.length\"'!==5)throw Error('\"'count');for(const p of s.pendulums){if(\"'!Number.isFinite(p.bob.x+p.bob.y+p.angle_deg))throw Error('\"'invalid');}}\nif(/https?:|src=|href=/.test(html))throw Error('external reference');\nconsole.log('JavaScript syntax and 31 state samples passed; '+Buffer.byteLength(html)+' bytes.');\nEOF\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"node - <<'EOF'\nconst fs=require('fs'),vm=require('vm');\nconst html=fs.readFileSync('out/scene.html','utf8');\nconst script=html.match(/<script>([\\\\s\\\\S]*?)<\\\\/script>/)[1];\nnew vm.Script(script);\nconst noop=()=>{};const ctx=new Proxy({}, {get:()=>noop,set:()=>true});\nlet now=100;\nconst sandbox={performance:{now:()=>now},document:{getElementById:()=>({getContext:()=>ctx})},window:{},requestAnimationFrame:noop};\nvm.runInNewContext(script,sandbox);\nfor(let i=0;i<31;i++){now=100+i*100;const s=sandbox.window.sceneState();if(s.pendulums.length\"'!==5)throw Error('\"'count');for(const p of s.pendulums){if(\"'!Number.isFinite(p.bob.x+p.bob.y+p.angle_deg))throw Error('\"'invalid');}}\nif(/https?:|src=|href=/.test(html))throw Error('external reference');\nconsole.log('JavaScript syntax and 31 state samples passed; '+Buffer.byteLength(html)+' bytes.');\nEOF\"", "aggregated_output": "JavaScript syntax and 31 state samples passed; 2462 bytes.\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_5", "type": "agent_message", "text": "Created [out/scene.html](out/scene.html) with continuous animation, correct pendulum periods, and live `sceneState()` calculations.\n\nValidated JavaScript syntax and 31 state samples. The file is 2,462 bytes with no external references."}}
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