OpenAI has launched ChatGPT-5.1, an upgraded version of its generative AI chatbot, just three months after the release of ChatGPT 5. This new model is described as smarter, more reliable, and significantly more conversational. The update introduces two variants: GPT-5.1 Instant and GPT-5.1 Thinking. GPT-5.1 Instant offers improved tone controls, making it warmer, more intelligent, and better at following user instructions, with a notable increase in playfulness while maintaining clarity. GPT-5.1 Thinking is an advanced reasoning model that is now easier to understand and faster for simple tasks, while also being more persistent on complex ones. ChatGPT-5.1 incorporates adaptive reasoning to enhance its performance in mathematical and coding evaluations, deciding when to think more deeply for accurate answers. The company has made it easier for users to shape ChatGPT’s tone based on feedback, aiming for responses that better match desired conversational styles. The GPT-5.1 Thinking model is designed for clearer, less jargon-filled responses, improving comprehension of technical concepts. Additionally, a GPT-5.1 Auto variant will automatically route queries to the most suitable model, eliminating the need for user selection. OpenAI states this release represents a step forward in both capability and usability, promising smarter answers and more natural tones.
