Don't like ChatGPT's tone? Change it. That's the gist of OpenAI's latest update to the language model behind the industry-leading chatbot. GPT-5.1, announced in a blog post Wednesday, is supposed to be "more conversational" than its predecessor, and you have more flexibility to adjust its "personality" to suit your desires.

The new model is actually two models: GPT-5.1 Instant and GPT-5.1 Thinking. The former is the latest version of OpenAI's basic language model. The company said it's "warmer, more intelligent, and better at following your instructions" than its predecessor .

GPT-5.1 Thinking is the new iteration of OpenAI's advanced reasoning model. The company said its changes for Thinking focused on making it easier to understand. In its blog post, OpenAI reported that

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