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GPT-6 Astra
OpenAI's most capable model
About GPT-6 Astra
GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work — advanced analysis, software engineering, deep research, scientific work and document creation, with particular strength on long-horizon tasks that span many steps.
It carries a 1.05-million-token context window and can return up to 128K tokens in a single reply, so it holds an entire codebase or research corpus in view while it works. Available to Premium subscribers and pay-as-you-go users.