Astra had to map 3D game spaces and understand the puzzles before it could plan solutions and succeed.
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Watch On The video above has Astra’s thinking/pauses removed to make watching somewhat bearable.
“The model controls Portal through MCP [Model Context Protocol] + a modified SourcePauseTool,” explains CozyBlaze. “The game stays paused while the model thinks; once the model sends an input sequence, SPT unpauses and executes it.” During the thinking time, the AI received screenshots and information about the player character position. After this, the game resumed, and Astra executed its planned moves and inputs. This is why the edited highlights reel is ~ 2 hours, but the full set of GPT-6 Astra Portal VOD streams adds up to ~24 hours.
And… GPT-6 Astra has autonomously completed Portal! I didn’t expect this to happen so soon, but I’m glad we've made so much progress here.I was reminded that back in 2016, one of OpenAI’s technical goals was to “solve a wide variety of games using a single agent.” pic.twitter.com/2nVREdCbMI September 5, 2026
CozyBlaze is pragmatic about the achievement. They admit there are still many problems to solve, and this runthrough shouldn’t be viewed as an AI benchmark. “But watching a general-purpose agent autonomously navigate and make it all the way through the game feels like a small glimpse of that original vision becoming real,” they observe. That original vision is OpenAI’s from way back in 2016, when an eventual goal of a single agent solving a variety of games was mentioned.
If you want to see the inner workings of CozyBlaze’s Portal Agent , it is available on GitHub. There are some instructions there for you to explore it or try it for yourself, too.
AI coder gets Doom running on a custom CPU designed by GPT-5.6 Sol
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Reference reading
- https://www.tomshardware.com/tech-industry/artificial-intelligence/SPONSORED_LINK_URL
- https://www.tomshardware.com/tech-industry/artificial-intelligence/openais-gpt-6-astra-model-autonomously-completes-portal-in-24-hours-feat-cost-just-usd571-in-tokens#main
- https://www.tomshardware.com/membership
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