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OpenAI API: 2026-09-03 — Released GPT-6 Astra, our most capable model, built for the hardest end-to-end work.

OpenAI API Changelog · article · Sep 3, 2026 · UTC

Released GPT-6 Astra, our most capable model, built for the hardest end-to-end work. Use GPT-6 Astra for reasoning, coding, computer use, research, and document creation. It combines these capabilities to carry complex tasks from an initial request to a finished result, using the context and tools you provide. Key changes to consider when migrating: GPT-6 Astra does not support the none reasoning effort level. GPT-6 Astra does not support custom temperature or top_p values or log probabilities (logprobs). Tool calling requires the Responses API. If you use tools with Chat Completions, follow the Responses migration guide. Misalignment monitoring asynchronously checks for potential issues during agent work in supported Responses API requests. Checks can trigger safety alerts or stop a conversation for review. Start with Using GPT-6 Astra for capabilities, prompting, and migration guidance. Explore computer use for browser and desktop workflows, and see pricing for available inference tiers. Added new controls for long-running work with GPT-6 Astra in the Responses API: Async tool calling: Let the model continue working while your application runs function or custom tools, then retur

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