Overview

GPT-6 Astra launched in September 2026 at the top of OpenAI’s GPT-6 lineup. In the API it takes text and image input, produces text, and supports functions, web search, file search and computer use, with reasoning effort from low to max.

Highlights

  • 1.05M-token context window (922K maximum input)
  • Up to 128K output tokens
  • Reasoning effort settings from low to max
  • Tools: functions, web search, file search, computer use
  • Knowledge cutoff April 30, 2026

Typical uses

Complex agents, coding, research and professional document work.

Things to consider

  • The most expensive model in the GPT-6 API lineup.
  • Rollout started with a limited set of organizations before reaching ChatGPT paid plans and the API.

Specifications are taken from the provider’s official announcement, documentation or model card. Benchmark results depend on evaluation settings; see how AI benchmarks work.