OpenAI has released the GPT-5.1 family of models. GPT-5.1 Instant is a high-volume model that uses adaptive reasoning – it can decide when to think longer on hard prompts. GPT-5.1 Thinking can vary its deliberation for each question, so simple tasks are faster and complex work gets deeper analysis. GPT-5.1 Auto routes queries between models. ChatGPT has gained stronger personalization controls – users can now pick between different personalities.
ChatGPT
GPT-5.1 Launch: A Smarter, More Conversational ChatGPT
OpenAI has released its latest models, GPT-5.1 Instant and GPT-5.1 Thinking, which improve performance and enable more customized behavior.