"OpenAI has introduced GPT-5.1, an update to its GPT-5 model, aiming to deliver faster responses, improved reasoning, and more flexible conversational controls as the company works to refine its ChatGPT experience for both consumer and enterprise users.The release includes new Instant and Thinking variants designed to offer more adaptive reasoning and a broader range of personalization options, the company said in a blog post."
"In a separate Substack post, OpenAI CEO for Applications, Fidji Simo, said these chat models are "trained using the same stack as our reasoning models," adding that they "score higher on factuality and complex problem-solving than GPT-5, while also introducing a more natural, conversational tone.""
""The model is quicker to pick up intent, less likely to wander, and noticeably better at keeping a steady voice from one message to the next," said Sanchit Vir Gogia, chief analyst, founder, and CEO of Greyhound Research."
GPT-5.1 improves ChatGPT with faster responses, enhanced reasoning, and expanded conversational controls via Instant and Thinking variants that enable adaptive reasoning and personalization. The model is rolled out across free and paid ChatGPT tiers, with enterprise and education customers receiving brief early access before default deployment, and API access available. Training aligns with reasoning-model stacks and yields higher factuality and complex-problem-solving performance alongside a more natural conversational tone. Personalization presets include professional, friendly, candid, quirky, efficient, cynical, and nerdy, and custom instructions aim to persist across multi-turn conversations. Subtle behavioral shifts reduce enterprise friction and operational waste.
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