OpenAI has launched GPT-5.1, a major update to ChatGPT that introduces two models—Instant and Thinking—designed to balance speed and depth. The Instant model offers quicker, more casual replies with a warmer tone, while the Thinking model handles complex tasks with clearer reasoning. A standout feature is the addition of eight personality presets, including Friendly, Quirky, and Professional, allowing users to tailor tone and style. GPT-5.1 also improves instruction-following and adaptive reasoning. The rollout begins with paid users and will soon become the default across ChatGPT, marking a significant step in AI personalization and usability.
by rrollins
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