Claude Opus 5.5 in Claude Code 2.1.280
skills off
Our harness configuration killed the run before any output. Not a model failure.
Wall time 15m 22sCost $0.70 estimated
Review
No verdict yet.
The full review
Harness-config failure (ours). Our harness configuration cut the run (API Error: Stream idle timeout - no chunks received); 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.
- Attempt 1 Harness-config failure (ours) this run15m 22s$0.702026-09-30
- Attempt 2 OK the cell's result4m 08s$0.642026-09-30
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, 909 characters. Every result for this prompt
Build a single-page Three.js scene (one index.html file, no build step, three.js from a pinned CDN) with a rigged humanoid character (a procedural skeleton and simple body meshes are fine) that plays walk, run and jump cycles, with on-screen buttons or keys to switch between them and blend smoothly from one to the next. The motion must look human, not spider-like: respect realistic joint limits (knees and elbows bend one way only, no joint rotates past a human range), feet plant on the ground with no sliding while in contact, the pelvis bobs and the torso stays upright with natural counter-rotation of shoulders and hips, and arms swing opposite to the legs. Include a ground grid, an orbit camera and a toggle that shows the skeleton. It must run at 60 fps in a desktop browser and work with touch. Write everything into the working directory and finish with a short README.md describing the controls.
How it was made
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 3 steps
Loading the timeline…
Download the full transcript Claude Code session JSONL, 199 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 $0.70, estimated from the token counts at list price.
| Tokens by type | Tokens | $ per 1M | Cost |
|---|---|---|---|
| Input (uncached) | 2 | $4.00 | $0.0000 |
| Cache write | 5,968 | $5.00 | $0.0298 |
| Cache read | 24,357 | $0.20 | $0.0049 |
| Output | 33,279 | $20.00 | $0.6656 |
| of which reasoning | 33,058 | billed as output |
- Total computed from tokens
- $0.7003
- 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): prompts/humanoid_motion_cycle.md verbatim (written 2026-09-30 from a public X post GPT-6 Sol human motion looks spider-like)
- 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