GPT-6 Astra beat Portal start to finish without human help in under 24 hours
Developer cozyblaze ran GPT-6 Astra through the full game Portal unaided in 23h43m using MCP-based control tooling.
A developer reported on X that OpenAI's GPT-6 Astra model completed the entire game Portal without human help, reaching the credits in about 23 hours and 43 minutes. The agent controlled the game via MCP and a modified SourcePauseTool that paused gameplay while the model reviewed screenshots and picked inputs. Token costs would total at least $570 at list price, though the run used a $200 Codex subscription. Code and documentation were published on GitHub.
- Run completed in roughly 23 hours 43 minutes without human intervention.
- Agent used MCP plus a SourcePauseTool mod that pauses the game during reasoning.
- Unmodified pricing would cost about $570 in tokens; a $200 Codex subscription was used instead.
- Code and docs available on GitHub; echoes OpenAI's 2016 general-game-agent goal.
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From the original article
1 min read at the-decoder.com
GPT-6 Astra beat the puzzle game Portal entirely on its own in about 24 hours, with zero human help after the initial goal was set. Developer cozyblaze published the code and docs on GitHub. His takeaway: Astra is "the worst model we'll ever get."
By Matthias Bastian · the-decoder.com
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