OpenCode (DeepSeek V4 Pro via OpenRouter) in a Vercel Sandbox. Starter only (AGENTS.md, serve.py, player/, helpers/dom/view_kit). No hardcoded demo code. Cursor did not edit workspace/.
2026-10-15 · task N4eUBkxZMISw · opencode · openrouter/deepseek/deepseek-v4-pro-0813
Build a 3D walking robot I can watch, using a real physics simulator's picture rather than a cartoon. Offer two bodies: a humanoid and a low four-legged one. The point is to stay up and move forward. Falling ends the round. Do not ask a person to control every joint. There are too many. A person can be turned off, while an automated controller still uses the full controls. If you show buttons, keep them coarse: hold still, or lean forward, back, left, right. Show the simulator's own view and the score it produces. The two robots should be separate rounds.
Running the prompt-created workspace on this machine — not a mock. Save an episode, then open Replay below to scrub the timeline.
opening · 0 ms
Exact files the agent wrote — not rewritten by hand.
# AI : shared Action contract — the page posts {"move": "..."}; keep this shape.
from pydantic import BaseModel
class Action(BaseModel):
move: str