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OpenAI · model release

OpenAI o3 and o4-mini

ChatGPT gets two reasoning models that think longer and can use tools like search and code on their own.

In detail

OpenAI released o3 and o4-mini, models in its o-series trained to think for longer before answering, with full tool access in ChatGPT. OpenAI later added o3-pro for Pro users on 10 June 2025.

Sources

  1. Introducing OpenAI o3 and o4-mini · OpenAI · Primary source

Last checked 11 November 2026.

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