Claude Fable 5.1 in Claude Code 2.1.280
skills off
Zoom, inline player and more ways to view
The model's own page, run in a sandboxed frame only when you ask (a page that needs its own origin opens in a new tab on a separate demo site). Phones get a full-screen player capped at 1.5x pixel density (2x on larger screens) so it stays smooth; the original page runs uncapped. Tap inside for sound.
Wall time 34m 02sCost $14.04 estimated
Review
No verdict yet.
The full review
OK. Finished on its own after 34.0 min.
Scores
AI judge
Not scored
No rubric for this prompt
Visitor votes and reviewer grades are not available yet.
- AI judge
- AI judge: the test runner (model claude-opus-5-5), scoring by visual review of the 1600 px render against the pre-registered rubric. No AI-judge score exists for this result: there is no rubric for this prompt, so no score is shown and none is made up.
- Visitors
- Public voting with a blind reveal is coming: you score the output first, then see the other scores.
- Reviewer
- The reviewer's own grade appears here once it is added.
Scores compare results for the same prompt only. AI-judge boards rank runs within one prompt, equal totals sharing a rank; scores from different prompts are never averaged.
Downloads
Files actually published for this run. Original output, site-made previews and post-run conversions are labelled separately.
The exact prompt
as run, 2,081 characters. Every result for this prompt
Build a working browser music studio in one page, in the spirit of a classic drum machine plus a tiny DAW. It needs: an 8-track by 16-step sequencer (kick, snare, closed hat, open hat, clap, tom, bass, lead) where every sound is synthesized with the Web Audio API (no samples); per-step velocity (click or tap cycles levels) and per-track mute, solo, volume, pan and a simple filter knob; a piano-roll editor for the bass and lead tracks over two octaves; tempo (60 to 180 BPM) and swing controls; four pattern slots A to D with a song arranger row to chain them; a master section with a compressor and a visual spectrum analyser and waveform scope driven by an AnalyserNode; transport with play, stop and a playhead that lights each step in time; and export of the current pattern as JSON plus import from JSON. Audio must start only after a user gesture (show a clear Start audio button), but the visuals must not wait for it. Seed it with four good-sounding patterns that make a short song. So the page is alive without input, on load it runs the sequencer silently in demo mode with the playhead moving, steps lighting, the scope and spectrum animating from the synthesized signal (route audio to the analyser but keep the output muted until the user presses Start audio), cycling through the four patterns and occasionally toggling steps as if someone were jamming, until the user touches anything. Make it look like premium music hardware: knobs, LEDs, tactile buttons. Save it as index.html in the current directory: one self-contained file with inline CSS and JavaScript only, no libraries or frameworks, and no external requests of any kind (no CDNs, web fonts, images or audio files). It must work when opened directly from disk, fit any window from a 390 px wide phone to a desktop, and run without console errors. You may serve it locally and open it in headless chromium (/usr/bin/chromium, software WebGL, no GPU) to screenshot and inspect your own output, and iterate on your own before finishing. Close any browser you open as soon as you've taken your screenshot.
How it was made
Versions saved during the run
3 intermediate outputs, in the order the model wrote them.
No transcript was delivered with this result.
Cost breakdown
Headline cost $14.04, estimated from the token counts at list price.
| Tokens by type | Tokens | $ per 1M | Cost |
|---|---|---|---|
| Input (uncached) | 1,154 | $10.00 | $0.0115 |
| Cache write | 396,701 | $12.50 | $4.9588 |
| Cache read | 6,249,048 | $0.25 | $1.5623 |
| Output | 150,137 | $50.00 | $7.5069 |
| of which reasoning | 93,998 | billed as output |
- Total computed from tokens
- $14.04
- Total reported by the harness
- none
Computed from harness-reported token counts x list prices.
Prices: Project price table (vendor list prices), 2026-09-22.
Run notes
- frozen prompt (written): written 2026-10-05 for the MR category expansion (owner request: 500 finished runs in every category); category app_clones; zero results
- plain wave-1-equivalent cc_config copy (settings.json + .claude.json; no ECC files)
- Mode: interactive TUI in tmux (160x48), inside bubblewrap sandbox
- Context setting: 1M ([1m] model name)
- Isolation audit: none
- Renderer: Canvas 2D (getContext('2d') at index.html line 741) with DOM/CSS UI; single self-contained index.html, no CDN and no external assets.
- Card video: the run's own session capture (headless Chromium, no GPU), re-encoded as H.264. Poster: the run's own render.png.
- Same frozen prompt as the other rows on this test; configurations differ and all rows are unscored, so this is not a head-to-head result.