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Claude Opus 5.5 in Claude Code 2.1.280

skills off

← Open in the gallerySame prompt, all models

Claude Opus 5.5: X16 engine

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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).

Did not settle in our check.

OKX16 enginemax effortNeutral harness

Wall time 2h 48mCost $25.18 estimated

Generation timelapse

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Generation timelapse (the agent's screen during the run, sped up). This is not the finished video. Download video (2.8 MB).

Review

No verdict yet.

The full review

OK. Finished on its own after 168.3 min.

Attempt 2 of 2

Every try of this model in this harness on this prompt, oldest first. This run is the cell's result.

  1. Attempt 1 Stopped by us42m 59s$5.812026-09-26
  2. Attempt 2 OK this run2h 48m$25.182026-09-26

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, 725 characters. Every result for this prompt

Build a conceptual X-16 engine in 3D with Three.js: four cylinder banks, one crankshaft and exposed mechanics inspired by experimental multi-bank engine architectures. Make it animate (pistons, rods and crank moving in sync) with orbit controls. Everything is built in code from Three.js geometry, shaders and materials; no external models or textures. Build it as a single self-contained index.html in the current directory. Three.js may load from a CDN or be vendored. 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 2h 48mFirst artifact at 39m 48s14 saved versions

Versions saved during the run

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

Version 33 of 14
  1. Version 1 at 39m 51s thumbnailv1 39:51
  2. Version 21 at 1h 53m thumbnailv21 1:53:42
  3. Version 22 at 1h 57m thumbnailv22 1:57:22
  4. Version 23 at 1h 57m thumbnailv23 1:57:33
  5. Version 24 at 2h 00m thumbnailv24 2:00:09
  6. Version 25 at 2h 02m thumbnailv25 2:02:57
  7. Version 26 at 2h 03m thumbnailv26 2:03:08
  8. Version 27 at 2h 05m thumbnailv27 2:05:01
  9. Version 28 at 2h 05m thumbnailv28 2:05:23
  10. Version 29 at 2h 10m thumbnailv29 2:10:41
  11. Version 30 at 2h 16m thumbnailv30 2:16:47
  12. Version 31 at 2h 18m thumbnailv31 2:18:26
  13. Version 32 at 2h 25m thumbnailv32 2:25:23
  14. Version 33 at 2h 41m thumbnailv33 2:41:01

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 29.2 MB; it is published as a scrubbed, compressed download rather than shown on the page.

Show all 181 steps

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Download the full transcript Claude Code session JSONL, 364 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 $25.18, estimated from the token counts at list price.

Tokens by typeTokens$ per 1MCost
Input (uncached)244$4.00$0.0010
Cache write1,505,506$5.00$7.5275
Cache read48,291,175$0.20$9.6582
Output399,771$20.00$7.9954
of which reasoning288,486billed as output
Total computed from tokens
$25.18
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

one prompt, agentic harness (self-review allowed)labelled re-run (of x16_engine__claude-code__opus-5-5__attempt1)

  • frozen prompt (written): engine/prompts_written/x16_engine.txt: a new test's prompt written by us from the project lead's brief (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