LongCat 2.5 Preview in OpenCode 1.18.32
skills off
We ended the run ourselves before any output. Not a model failure.
Wall time 12m 24sCost $0 reported
Generation timelapse
Generation timelapse (the agent's screen during the run, sped up). This is not the finished video. Download video (108 KB).
Review
No verdict yet.
The full review
Stopped by us. Stopped by us (box row cap reached (1034s); stopped by the box lane so the run ships as partial); not a model failure.
Attempt 2 of 2
Every try of this model in this harness on this prompt, oldest first. This run is the cell's result.
- Attempt 1 Error19m 05s$02026-09-26
- Attempt 2 Stopped by us this run12m 24s$02026-09-26
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
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 28 steps
Loading the timeline…
Download the full transcript OpenCode session export, 141 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, as reported by OpenCode (its own bill for the run).
| Tokens by type | Tokens | $ per 1M | Cost |
|---|---|---|---|
| Input (uncached) | 40,869 | n/a | n/a |
| Cache write | 0 | n/a | n/a |
| Cache read | 221,824 | n/a | n/a |
| Output | 24,617 | n/a | n/a |
- Total computed from tokens
- unknown
- Total reported by the harness
- $0
OpenCode 1.18.32 reported its own total; token counts x list prices shown beside it. No list price for longcat-2.5-preview-free in config/prices.json; no estimate computed. The harness reports reasoning tokens separately from output; here output includes them (1,238 visible + 23,379 reasoning), and both bill at the output rate.
Run notes
- frozen prompt (rewritten): engine/prompts_rewritten/threejs_tidewater.txt: written by us from the recorded description (zero results)
- plain OpenCode config copy (providers only; no ECC instructions/agents)
- opencode export written to a file (not piped)
- Mode: interactive TUI in tmux (160x48), inside bubblewrap sandbox
- Isolation audit: outside paths seen