OpenAI is releasing GPT-5.1 today, an update to the flagship model it released in August. OpenAI calls it an “upgrade” to GPT-5 that “makes ChatGPT smarter and more enjoyable to talk to.”

The new models include GPT-5.1 Instant and GPT-5.1 Thinking. The former is “warmer, more intelligent, and better at following your instructions” than its predecessor, per an OpenAI release, and the latter is “now easier to understand and faster on simple tasks, and more persistent on complex ones.” Queries will, in most cases, be auto-matched to the models that may best be able to answer them. The two new models will start rolling out to ChatGPT users this week, and the old GPT-5 models will be available for three months in ChatGPT’s legacy models dropdown menu before they disappear.

As part of the upda

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