Claude Sonnet 5.5 (effort default (no --effort flag) · thinking on) on Animate planets orbiting the sun at their own speeds in one self-contained HTML file

AClaude Sonnet 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-22 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.05
Wall time: 20s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Animate planets orbiting the sun at their own speeds in one self-contained HTML file Make a small animated scene: a solar-system orrery. 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): `{sun: {x, y}, planets: [{name, angle}, ...]}`. Extra fields are fine. It must describe what is actually drawn. - Each planet in spec.json has a `period_s`: the seconds one full orbit takes on screen. - 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. `all_planets`: `sceneState().planets` names exactly the planets in spec.json and `sceneState().sun` is present. 5. `orbital_speeds`: over about 3 s, each planet's `angle` (radians) advances by 2π × elapsed / `period_s` within 10%, and all planets orbit the same way. 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.

Make a solar-system orrery animation as one self-contained HTML file. A headless browser checks objective facts only: the file is offline and small, a canvas or SVG stage is drawn, frames change over time, the scene behaves as specified (all planets; orbital speeds) and nothing errors. A poster PNG and a short MP4 are captured for the gallery. Looks are not scored. Original benchmark task written for usecaserank.com (not based on a specific public post). Headless, offline run on a reproducible fixture. Each run's notes say how its cost was measured (estimates are marked).

Success criteria: self_contained has_canvas_or_svg frames_change all_planets orbital_speeds no_console_errors

Setup notes: Batch 28 case d04-orrery-planets-orbiting-sun (offline, synthetic inputs, seed 231041467). Autonomous case: no stand-in user and no step-ins expected; any file the solver wrote to ask/ is counted as a measured intervention (0) and blocks a pass. Prompt = TASK.md verbatim. Hidden key kept outside the solver's work dir. Scored with the case's scorer (python3 score.py WORKDIR KEYDIR, absolute paths); pass = every check true and no ask/ files. Tools: Read/Write/Edit/Glob/Grep/Bash, web disabled. Single run, no retries. 1-min load average at scoring 0.42 (8 cores). Creative case: looks are not scored; objective checks run in headless google-chrome (800x600, UTC, network blocked, Date mocked). Gallery media (3 s capture: poster.png + clip.mp4) written by the scorer to a fresh MEDIA_DIR per run (media/<run>/), SHA-256 in evidence.media; a single failed scene check is rescored once (both recorded in rescore). Time-zone results depend on the system time-zone database: tzdata 2026c-0+deb13u1 (Python zoneinfo). Claude Code's own reported cost for claude-sonnet-5.5: $0.048136. Score: 6/6. Cost is an ESTIMATE: measured tokens x pricing.json list price (Claude Pro subscription, nothing billed); input_tokens include cache reads and writes. Single run.

Estimated cost List-price estimate; not actually billed.

Output

Metrics

Estimated cost: $0.05
Wall time: 20s
Human step-ins: 0
Turns: 3

Model usage
Model	Input tok	Output tok	Cost
AClaude Sonnet 5.5anthropic/claude-sonnet-5.5effort default (no --effort flag) · thinking on	57,742	1,342	$0.05

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Sonnet 5.5 (anthropic/claude-sonnet-5.5, effort default (no --effort flag) · thinking on) via Claude Code 2.1.299 (headless -p), cloud.
It counts as a success only if it meets every success criterion: self_contained has_canvas_or_svg frames_change all_planets orbital_speeds no_console_errors
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

Trust 80% comes from these checks (how Trust % works).

Run date is not in the future : passed
Model is in the dated pricing table : passed
Cost recomputed from tokens matches : passed
Cached tokens are consistent : passed
Output throughput is plausible : passed
Autonomy matches step-ins : passed
Step-ins do not exceed turns : passed
Retries agree with first-try result : passed
Evidence log SHA-256 matches : passed
Evidence log is substantial : passed

Evidence log

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   "output_tokens_details": {
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   "server_tool_use": {
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   "cache_creation": {
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     "cache_creation": {
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     "type": "message"
    }
   ],
   "speed": "standard",
   "fallback_credit": null
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  "modelUsage": {
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    "outputTokens": 1342,
    "cacheReadInputTokens": 50318,
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    "costUSD": 0.0481358,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 218,
    "canonicalModel": "claude-sonnet-5-5",
    "provider": "firstParty",
    "costBasis": "list"
   }
  },
  "permission_denials": [],
  "terminal_reason": "completed",
  "fast_mode_state": "off",
  "fast_mode_disabled_reason": "sdk_opt_in_required",
  "subagent_stats": {
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   "requested": {
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  "safety_stops": 0,
  "is_error": false,
  "num_turns": 3,
  "subtype": "success",
  "api_error_status": null,
  "result": "I wrote `out/scene.html`, but I haven't opened it in a browser or run any of the six checks against it.\n\n- **Stage:** one 720x480 `<canvas>` with the title \"Orrery 541\". It draws a sun at (360, 240) and four planets, Dune, Frost, Gale and Haze, on concentric orbit rings. A `requestAnimationFrame` loop animates it from load.\n- **Speeds:** each planet's angle is 2\u03c0 \u00d7 elapsed seconds / `period_s`, using the periods 6, 11, 17 and 19 s from `spec.json`. All four go the same way (clockwise on screen, since y points down).\n- **`sceneState()`:** it returns the sun position and each planet's name, angle and x/y. The angle is not wrapped at 2\u03c0, so it keeps increasing. It's computed at the moment you call it, so it can differ from the last drawn frame by up to about one frame (~16 ms).\n- **Self-contained:** everything is inline, with no URLs, external scripts, fonts or images. The file is a little over 1 KB, well under the 200,000-byte limit.\n\nI did not add any console logging, so the page should log no errors.",
  "ttft_ms": 3064,
  "type": "result",
  "duration_ms": 19382,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 2442,
  "time_to_request_ms": 235,
  "first_content_frame_ms": 2442,
  "queued_turn_count": 0,
  "result_index": 0
 }
]