Claude Haiku 5.5 (effort default (no --effort flag) · thinking on) on Animate a snow globe that a click shakes, with snow that settles again, in one self-contained HTML file

AClaude Haiku 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: $0.01
Wall time: 1m
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Animate a snow globe that a click shakes, with snow that settles again, in one self-contained HTML file Make a small animated scene: a snow globe. 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): `{flakes: [{x, y}, ...]}`. Extra fields are fine. It must describe what is actually drawn. - On load the snow lies settled. A click on the stage (pressing Space as well is fine) shakes it; the snow swirls and must come fully to rest within `settle_s` seconds of the click. - 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. `settled_until_shaken`: `sceneState().flakes` has at least `min_flakes` entries and, before any click, no flake moves 0.5 px or more between samples 0.5 s apart. 5. `shake_then_settle`: a click on the stage centre shakes the globe (median flake movement over the next 0.3 s is above 3 px) and, `settle_s` + 1.2 s after the click, no flake moves 0.5 px or more in 0.4 s. 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 snow globe 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 (settled until shaken; shake then settle) 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 settled_until_shaken shake_then_settle no_console_errors

Setup notes: Batch 28 case d02-snow-globe-shake-and-settle (offline, synthetic inputs, seed 1252924170). 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 0.31 (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-haiku-5.5: $0.013708. 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: $0.01
Wall time: 1m
Human step-ins: 0
Turns: 8

Model usage
Model	Input tok	Output tok	Cost
AClaude Haiku 5.5anthropic/claude-haiku-5.5effort default (no --effort flag) · thinking on	235,221	14,380	$0.01

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Haiku 5.5 (anthropic/claude-haiku-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 settled_until_shaken shake_then_settle 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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   "service_tier": "standard",
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   "speed": "standard",
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  "modelUsage": {
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    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 7439,
    "canonicalModel": "claude-haiku-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": {
   "spawned": 0,
   "requested": {
    "background": 0,
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   "started_in_background": 0,
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  "safety_stops": 0,
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  "num_turns": 8,
  "subtype": "success",
  "api_error_status": null,
  "result": "I wrote `out/scene.html` (about 7 KB, single file, no network references). In my own headless Chrome run, all six checks pass, but I haven't verified against the real grader.\n\nMy run of the check logic:\n- **self_contained:** no URLs in the file, and no network requests were made when it was opened.\n- **has_canvas_or_svg:** a 640x400 canvas, visible on load.\n- **frames_change:** all 30 screenshots over 3 s were distinct. A slow glare sweeps the glass and the flakes twinkle, so the scene animates while at rest without moving any flake.\n- **settled_until_shaken:** 72 flakes (spec `min_flakes` is 59), with zero movement before any click.\n- **shake_then_settle:** the median flake moved about 21 px in the 0.3 s after a centre click, and no flake moved in the 0.4 s window at `settle_s` + 1.2 s.\n- **no_console_errors:** no exceptions, `console.error` or browser errors.\n\nChoices I made:\n- The shake is a damped sine per flake, clamped to the inside of the glass. It ends by 1.2 s, ahead of the 2 s `settle_s` in `spec.json`.\n- Clicks and taps on the canvas, and the Space key, both trigger a shake.\n- The flake positions come from one function, used for both drawing and `window.sceneState()`, so the reported state matches what is drawn.\n- The snow is seeded, so every load looks the same.\n\nThe test harness I used is in `/tmp/sgtest/run.mjs`, outside `out/`. The repo is not under git, so nothing was committed. I did not write to `ask/`.",
  "ttft_ms": 2170,
  "type": "result",
  "duration_ms": 87826,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 1873,
  "time_to_request_ms": 298,
  "first_content_frame_ms": 1874,
  "queued_turn_count": 0,
  "result_index": 0
 }
]