On November 12, 2025, OpenAI unveiled its upgraded GPT-5 AI model, now featuring the “warmer” GPT-5.1 Instant and the “easier to understand” GPT-5.1 Thinking models. The Instant model is designed for speed, becoming the most popular choice, while the Thinking model adeptly handles both simple and complex queries, offering contextually appropriate responses. CEO Sam Altman praised the enhancements in instruction-following and adaptive reasoning, allowing the models to deliver smarter, more conversational interactions. Users can now customize ChatGPT to various communication styles, including Default, Friendly, and Professional. The rollout to paid users is gradual, with legacy models remaining accessible for three months, addressing past user concerns about sudden upgrades. OpenAI aims to balance innovation with user attachment, ensuring a smoother transition to the advanced capabilities of GPT-5.1.
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