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GPT-6 Astra completes Portal solo in under a day, no human input

GPT-6 Astra completes Portal solo in under a day, no human input
Image: The Decoder

The AI model finished the puzzle game Portal autonomously in roughly 24 hours, with its developer sharing code and notes online.

September 7, 2026 · 1 min read · HowToPrompts Newsroom

In a recent demonstration, the AI model GPT-6 Astra managed to play through the entirety of the puzzle game Portal without any outside assistance. The run took approximately 24 hours from start to finish, with no human intervention occurring after the initial objective was defined. The achievement highlights the model's ability to handle complex, multi-step tasks over an extended period.

The project was led by a developer who goes by the handle cozyblaze, who has since made the underlying code and accompanying documentation publicly available on GitHub. This open release allows others to examine the methods used and potentially replicate or build upon the results. The developer's comments suggest a forward-looking perspective on the progress of such systems.

In his notes, cozyblaze described Astra as 'the worst model we'll ever get,' implying that future iterations are expected to surpass this performance significantly. The statement frames the Portal completion not as a peak capability, but rather as a baseline for what is to come in the field of autonomous AI agents. The full account of the run was first reported by The Decoder.

Written in-house by the HowToPrompts newsroom, in our own words. The story was first reported by The Decoder.