OpenAI releases GPT-5.1, says new models are warmer and enjoyable to talk to

OpenAI has released GPT-5.1, featuring two variants, Instant and Thinking with a warmer conversational tone, beter instruction-following, and eight new personality presets for more natural, customizable interactions.

OpenAI has launched GPT-5.1, an upgrade to its flagship model, available in two versions: GPT-5.1 Instant and GPT-5.1 Thinking.

The Instant model focuses on delivering warmer, more human-like conversations and stronger instruction-following, while the Thinking model is designed for efficiency fast on simple tasks and persistent on complex reasoning problems.

GPT-5.1 also introduces eight personality presets, including Professional, Friendly, Candid, Quirky, Efficient, Nerdy, and Cynical, giving users more control over tone and interaction style. The rollout begins immediately, with earlier GPT-5 models continuing in legacy mode for paid users.

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