Altman: 'GPT-6 Astra is here'

Sam Altman's X launch post for GPT-6 Astra on Sept 3, 2026: he hopes it enables a new generation of entrepreneurship, scientific discovery and building, and claims it is the best model in the world for computer use, professional work, science, coding, cybersecurity and more, adding that it "took us some extra time" (a nod to the August RL pause and cyber gating). A follow-up post the next day announced availability to Pro/Enterprise/Business Premium in Work/Codex and the API. Verified via the X syndication endpoint (sama, 2026-09-03T19:49Z).

GPT-6 Astra is here.

We hope it will begin to enable a new generation of entrepreneurship, scientific discovery, and building.

We believe it is the best model in the world for computer use, professional work, science, coding, cybersecurity, and more.

It took us some extra time to ensure that we could meet the safety and alignment standards required for this capability level, but we think you’ll find it worth the wait.

It scores 98% on FrontierMath Tier 4, 99.9% on ARC-AGI 3, and 100% on ExploitBench.

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Archived 2026-09-29 via fxtwitter (unofficial).