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Claude Opus 5.5 in Claude Code 2.1.280

skills off

← Open in the gallerySame prompt, all models

Snapshot 1 of 1 saved during Claude Opus 5.5's run
Still snapshots saved during the run (no motion recording): 1 distinct frame.

Live page incomplete: it loads js/main.js, which the run never published, so it is not played here. The model's own file is published as it was left: open it (on the separate demo site).

Stopped by usTidewatermax effortNeutral harness

Wall time 43m 01sCost $6.49 reported

Snapshot 1 of 1 saved during Claude Opus 5.5's run
Still snapshots saved during the run (no motion recording): 1 distinct frame.

Generation timelapse

Poster for generation timelapse

Generation timelapse (the agent's screen during the run, sped up). This is not the finished video. Download video (459 KB).

Review

No verdict yet.

The full review

Stopped by us. Stopped by us (box row cap reached (2880s); stopped by the box lane so the run ships as partial); not a model failure.

Attempt 1 of 2

Every try of this model in this harness on this prompt, oldest first. A later attempt is the cell's result: attempt 2.

  1. Attempt 1 Stopped by us this run43m 01s$6.492026-09-26
  2. Attempt 2 OK the cell's result1h 58m$19.272026-09-29

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, 1,336 characters. Every result for this prompt

Build an explorable tropical island in Three.js. The island has white sand beaches, palm trees, a green hilly interior and a small fishing village of wooden huts with thatched roofs, joined to the sea by a long wooden pier with boats moored alongside. The ocean around it is animated, with waves, foam along the shore and clear shallow water over a reef where fish swim among corals and sea plants, fading to deep blue further out. Let the player switch between modes: walk on the island, swim at the surface, dive underwater (with underwater fog and caustic light), sail a small boat around the island, and fly a free camera. Add a time-of-day panel with a slider that moves the sun from morning through sunset to night, changing the sky, lighting and water colours, with stars and lit windows in the village at night. Show the controls on screen. Everything is built in code from Three.js geometry, shaders and materials; no external models or textures. Build it as index.html (plus any local asset files you create) in the current directory. Three.js may load from a pinned CDN. 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

Wall time 43m 01sFirst artifact at 35m 23s1 saved version

Versions saved during the run

1 intermediate output, in the order the model wrote them.

Version 1 of 1
  1. Version 1 at 35m 25s thumbnailv1 35:25

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 machine-format transcript is published as a scrubbed download.

Show all 27 steps

Loading the timeline…

Download the full transcript Claude Code session JSONL, 612 KB. 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 $6.49, as reported by Claude Code (its own bill for the run). The list-price estimate from the token counts is $6.48.

Tokens by typeTokens$ per 1MCost
Input (uncached)44$4.00$0.0002
Cache write231,750$5.00$1.1587
Cache read1,353,767$0.20$0.2708
Output252,699$20.00$5.0540
of which reasoning216,184billed as output
Total computed from tokens
$6.4837
Total reported by the harness
$6.4904
Difference
computed $6.48 vs reported $6.49 (diff -0.01)

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)prompt rewritten after the 2026-09-24 box losslabelled re-run (of threejs_tidewater__claude-code__opus-5-5)

  • frozen prompt (rewritten): engine/prompts_rewritten/threejs_tidewater.txt: written by us from the recorded description (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: outside paths seen