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OpenAI has unveiled GPT-5.1, an upgrade to its flagship GPT-5 model launched in August, describing it as an improvement that makes ChatGPT “smarter and more enjoyable to talk to.”

The update introduces two versions: GPT-5.1 Instant and GPT-5.1 Thinking. According to OpenAI, the Instant model is “warmer, more intelligent, and better at following instructions,” while the Thinking model is “easier to understand, faster for simple tasks, and more persistent on complex ones.”

ChatGPT will automatically route most queries to the model best suited for the task. The rollout for users begins this week, with the older GPT-5 versions remaining accessible for three months via the legacy models dropdown before being ph

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