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Preview · early version, more releases are being added · early version
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OpenAI · model release

OpenAI o1-preview

OpenAI releases a ChatGPT model that takes time to think through hard problems before answering.

In detail

OpenAI released o1-preview, the first of a series of reasoning models that spend more time thinking before answering, in ChatGPT and the API, alongside o1-mini.

Sources

  1. Introducing OpenAI o1-preview · OpenAI · Primary source

Last checked 11 November 2026.