Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Animate a print shop's printers stacking finished sheets in one self-contained HTML file

AClaude Opus 5.5default · thinking on · Claude Code 2.1.299 (headless -p) · cloud · 2026-10-26 · by @bobsiopener

Trust 80%Fully autonomoussuccess · first tryCompare

Estimated cost: $0.21
Wall time: 39s
Human step-ins: 0
Outcome: Pass

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Exact prompt

# Animate a print shop's printers stacking finished sheets in one self-contained HTML file Make a small animated scene: a print shop printer sheet stack. 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): `{printers: [{name, x, sheets_out, status: "queued" | "printing" | "done"}, ...]} (canvas px, y down; one entry per spec.json printer; x = the printer's centre; sheets_out = the whole number of finished sheets on its output stack)`. Extra fields are fine. It must describe what is actually drawn. - Time 0 is `performance.now()` 0 (seconds = `performance.now()` / 1000). Each printer has no finished sheets until its own `start_s`; after that one finished sheet lands on its output stack every `sec_per_sheet` seconds, so the first sheet lands at start_s + sec_per_sheet and sheets_out is the number of whole sheet intervals that have passed (rounded down, never rounded to the nearest), until all `sheets` are out at start_s + sheets × sec_per_sheet; the stack then stays at `sheets`. Draw each printer with its output stack growing by `sheet_px` pixels per sheet. `sceneState()` must return the state at the moment it is called. - 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. `sheet_count`: at every sample more than 0.05 s from that printer's `start_s` or from any moment a sheet lands, each printer's x is within 1.5 px of its spec.json `x`, and its sheets_out is exactly the whole number of finished sheets: 0 before `start_s`, then (seconds since start_s) ÷ `sec_per_sheet` rounded down, never more than `sheets`, and `sheets` once the job is done. 5. `printer_status`: at those samples each printer's `status` is queued before `start_s`, printing until all its sheets are out at start_s + sheets × sec_per_sheet, and done after that; the samples include queued, printing and done. 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 print shop printer sheet stack 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, the scene follows a timed specification (sheet count; printer status) 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 sheet_count printer_status no_console_errors

Setup notes: Batch 42 case tu07-print-shop-printer-sheet-stack-animation (offline, synthetic inputs, seed 1152310142). 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 1.22 (8 cores). Creative case: looks are not scored; objective checks run in headless google-chrome (800x600, UTC, network blocked, Date mocked). Gallery media (poster.png + clip.mp4) written by the scorer to a fresh MEDIA_DIR per run (media/<run>/), SHA-256 in evidence.media. Scored alone (no other check groups running), single scoring (a browser hold would be re-scored alone once). Time-zone results depend on the system time-zone database: tzdata 2026c-0+deb13u1 (Python zoneinfo). Claude Code's own reported cost for claude-opus-5.5: $0.206118. 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: $0.21
Wall time: 39s
Human step-ins: 0
Turns: 8

Model usage
Model	Input tok	Output tok	Cost
AClaude Opus 5.5anthropic/claude-opus-5.5effort default (no --effort flag) · thinking on	152,054	4,123	$0.21

Reproduce this run

Use the use case prompt on the use case page.
Same setup: Claude Opus 5.5 (anthropic/claude-opus-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 sheet_count printer_status 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": {
    "thinking_tokens": 319
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   "server_tool_use": {
    "web_search_requests": 0,
    "web_fetch_requests": 0
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   "service_tier": "standard",
   "cache_creation": {
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     "cache_creation": {
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   "speed": "standard",
   "fallback_credit": null
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    "cacheReadInputTokens": 140092,
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    "webSearchRequests": 0,
    "costUSD": 0.2061184,
    "contextWindow": 1000000,
    "maxOutputTokens": 128000,
    "thinkingTokens": 319,
    "canonicalModel": "claude-opus-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": {
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    "foreground": 0,
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   "started_in_background": 0,
   "max_depth": 0,
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  "safety_stops": 0,
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  "subtype": "success",
  "api_error_status": null,
  "result": "I wrote `out/scene.html`, a 3.9 KB self-contained page, and checked it once in headless Chrome. The page logged no errors.\n\nAt t \u2248 2.03 s, `sceneState()` returned the values the spec's timing rules give:\n\n| Printer | Started at | Status | Sheets out |\n|---|---|---|---|\n| Printer 1 | 1.8 s | printing | 0 (first sheet not landed yet) |\n| Printer 2 | 0.4 s | done | 5 (all out at 1.9 s) |\n| Printer 3 | 1.2 s | printing | 2 |\n\nThat was a single sample. I couldn't run the 30-screenshot frame-change check or repeated sampling because Playwright isn't installed here, so those checks are untested.\n\nHow it works:\n- **Stage:** one 760\u00d7500 canvas, placed at the top-left of the page, with the title from `spec.json`.\n- **Timing:** both the drawing and `sceneState()` work everything out from `performance.now()` at the moment they run. Sheets out is the number of whole intervals since `start_s`, rounded down and capped at the sheet total. Status is queued before `start_s`, printing until the last sheet lands, and done after that.\n- **Drawing:** each printer's stack grows by its own `sheet_px` per sheet from `base_y`, and a sheet is shown sliding out while the printer is printing.\n- **Continuous motion:** a spinning roller and a blinking status light keep the frames changing even after all printers are done.\n- **No network:** nothing is fetched from outside the file. The favicon is set to an empty inline value so the browser doesn't request one.",
  "ttft_ms": 1540,
  "type": "result",
  "duration_ms": 38092,
  "uuid": "[REDACTED]",
  "ttft_stream_ms": 906,
  "time_to_request_ms": 180,
  "first_content_frame_ms": 906,
  "queued_turn_count": 0,
  "result_index": 0
 }
]