OpenAI has once again pressed the upgrade button on its flagship chatbot, and this time, it’s getting a personality. The company has rolled out GPT-5.1, a new version of its model that it promises will make ChatGPT “smarter,” “more conversational,” and better at adapting to your preferred communication style. CEO Sam Altman kept things typically understated, calling it “a nice upgrade,” but under the hood, this is a bigger deal than it sounds. OpenAI says GPT-5.1 isn’t just more capable, it’s also warmer, wittier, and more human in how it talks back, over GPT 5 .

OpenAI GPT-5.1: What is new

The GPT-5.1 rollout comes in two flavours — GPT-5.1 Instant and GPT-5.1 Thinking — with paid ChatGPT users getting first dibs starting today.

The “Instant” model is meant to be the everyday engine

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