OpenAI today upgraded GPT-5 to GPT-5.1, the next-generation version of the AI model that powers ChatGPT. There are two versions of GPT-5.1, including Instant and Thinking.

Instant is warmer, more intelligent, and better at following instructions, according to OpenAI, while GPT-5.1 Thinking is easier to understand, faster on simple tasks, and more persistent on complex tasks.
OpenAI says that users can expect a more enjoyable communication experience, with options to more easily customize ChatGPT’s tone….

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