GPT-6 Astra completes Portal on its own, at a calculated cost of $571.
2026.09.08 10:57:54
Insight Beating AI News Flash: Independent developer cozyblaze has integrated GPT-6 Astra into Valve’s 3D puzzle game *Portal*. At the start, he only gave one instruction: complete the game from start to end credits without accessing the internet for walkthroughs. Astra successfully cleared the game in roughly 23 hours and 43 minutes, consuming around 435 million tokens, which translates to approximately $571 based on API pricing. Astra’s gameplay differs from human play: when it thinks, the game pauses, then it analyzes the current screen, character position, and perspective to decide its next move, where to look, and where to place portals before resuming the game. Mid-experiment, OpenAI’s service faced capacity issues, so the author manually resumed the task and later switched to the faster Fast mode. Public logs show no additional game prompts were provided to Astra from start to the appearance of the end credits. However, this is not a strict benchmark. *Portal* has been released for nearly 20 years, with a wealth of walkthroughs and videos online. Even though the experiment prohibited Astra from actively searching for walkthroughs online, it cannot rule out that relevant game knowledge was already included in its training data. What’s truly notable is that AI can now complete a task that lasts nearly a day and requires continuous observation and operation of a 3D environment.
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