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Claude Fable 5.1 in Claude Code 2.1.280

skills off

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Poster frame of Claude Fable 5.1's page
Open the original page

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. It starts in its auto-tour (T switches to play mode on a keyboard).

Stopped by usStillwater pondmax effortNeutral harness

Wall time 43m 02sCost $15.37 reported

Review

No verdict yet.

The full review

Stopped by us. Stopped by us (box row cap reached (2882s); stopped by the box lane so the run ships as partial); not a model failure.

Scores

Not scored: only runs that finished on their own are scored.

Downloads

Files actually published for this run. Original output, site-made previews and post-run conversions are labelled separately.

The exact prompt

as run, 2,431 characters. Every result for this prompt

Build "Millbrook Pond", a calm countryside pond diorama in Three.js, seen from above at a three-quarter angle. An irregular pond with soft grassy banks, rocks and reeds sits in a clearing ringed by trees and bushes, with a dirt path running around it. On one shore stands a small timber watermill cabin with a shingled roof and a stone chimney, and on its side a large wooden waterwheel turns continuously, its paddles dipping into the water and churning it. A plank dock juts out from the mill, a small arched wooden footbridge crosses an inlet, and a rowboat floats on the pond with a seated figure fishing, rod and line out; the boat bobs and drifts gently and the line's float makes small rings. The water is the star: a real-time reflective and refractive surface (a planar or render-target reflection of the mill, trees and sky; refraction of the shallow pond bed near the banks; depth-based tint from clear shallows to a dark centre) blended with a Fresnel term, soft normal-mapped wind ripples, and dynamic ripple rings from the waterwheel, the boat, the fishing float and the occasional rising fish, which spread and fade. Add gentle ambient life: swaying foliage, a few lily pads or drifting leaves, dragonflies or birds, and soft afternoon sun with shadows. The camera slowly orbits the pond on its own; the user can drag to orbit, pinch or scroll to zoom, and tap the water to make ripples, and a small unobtrusive control pauses the orbit and switches the time of day (for example afternoon and golden hour). The look is stylized and cohesive (low-poly or soft-shaded), and everything is built in code; no external models, textures or HDRIs. Also add a capture mode: opening index.html?capture=1 hides all UI and plays a scripted 12-second camera move around the pond that ends where it started, so it can be recorded as a seamless clip. Build it as index.html (plus any local asset files you create) in the current directory, with no build step; three.js and any addons may load from a pinned CDN. Aim for 60 fps on a laptop and at least 30 fps on a mid-range phone, with touch working. 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. Finish with a short README.md describing the controls and the capture mode.

How it was made

Wall time 43m 02sFirst artifact at 22m 38s10 saved versions

Versions saved during the run

10 intermediate outputs, in the order the model wrote them.

Step by step

The prompt, every agent turn and tool call (tool name and a one-line summary; inputs and outputs are not shown), then the final message. The full transcript is 6.4 MB; it is published as a scrubbed, compressed download rather than shown on the page.

Show all 46 steps

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Download the full transcript Claude Code session JSONL, 150 KB, gzip. Scrubbed: anything that looks like a key, token, e-mail address or phone number is replaced, and account details and the test machine's file paths are removed.

Cost breakdown

Headline cost $15.37, as reported by Claude Code (its own bill for the run). The list-price estimate from the token counts is $15.35.

Tokens by typeTokens$ per 1MCost
Input (uncached)1,122$10.00$0.0112
Cache write356,580$12.50$4.4573
Cache read5,821,985$0.25$1.4555
Output188,454$50.00$9.4227
of which reasoning124,699billed as output
Total computed from tokens
$15.35
Total reported by the harness
$15.37
Difference
computed $15.35 vs reported $15.37 (diff -0.02)

Claude Code 2.1.280 reported its own total; token counts x list prices shown beside it.

Prices: Project price table (vendor list prices), 2026-09-22.

Run notes

one prompt, agentic harness (self-review allowed)labelled re-run (of threejs_stillwater_pond__claude-code__fable-5-1)

  • frozen prompt (written): written 2026-10-02 for MR wave wa (owner request m:a155bced, after an X post of a three.js watermill pond demo; described in words, no assets or names copied); category threejs; 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