GPT-5.1 Instant and Thinking
Smarter, more conversational ChatGPT with new personalities
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GPT-5.1 Instant and Thinking are two variants of a ChatGPT model trained with the same stack as OpenAI's reasoning models. They score higher than GPT-5 on factuality and complex problem-solving, and add a more natural, conversational tone.
Instant is tuned for quick, everyday responses; Thinking spends more effort on harder problems. The split acknowledges that one default cannot suit every kind of use.
It is aimed at ChatGPT users who want stronger reasoning and a warmer tone, and the ability to pick between a fast conversational mode and a deeper reasoning mode depending on the task.
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Why we picked it
GPT-5.1 made the cut for the explicit Instant/Thinking split — acknowledging that a quick everyday question and a hard problem need different effort is a more honest design than one model trying to guess which mode you actually need every time.
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