Agent plays Portal to the credits: 23h43m autonomous run setup open-sourced
banteg · x · 2026-09-07
Developer cozyblaze open-sourced the full setup behind a "GPT-6 Astra" (via Codex) autonomous Portal run, claiming it reached the end credits on September 5 (San Francisco time) after about 23 hours 43 minutes, including capacity interruptions and a resume in Fast mode.
Architecture:
- The model emits JavaScript plans handled by a local MCP server
- The MCP server talks over TCP (127.0.0.1:27182) to a custom SourcePauseTool patch
- The game pauses while the agent thinks; the tool runs N ticks, then returns screenshots, player position, and camera angle
Web search and general shell/browser tools were disabled to isolate model capability, and the only extra instruction after the initial goal was to reach the credits. The repo includes the controller, patch, setup guide, and a sanitized session log. Caveat: the model name and date are unverified; treat this as a community-claimed demo.
Related event: GPT-6 Astra autonomously beats Portal in about 24 hours(3 posts)→
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