ChatGPT 5.1 is smarter, nicer, and better at actually doing what you asked

• OpenAI has unveiled its new GPT‑5.1 model and made it the default option for ChatGPT
• ChatGPT includes a faster Instant and more in-depth Thinking variations of GPT-5.1, and applies adaptive reasoning to decide when to use each
• ChatGPT has also added personality controls allowing users to adjust the manner and style of the AI's response, even mid-conversation

OpenAI has introduced the much-anticipated GPT-5.1 AI model, incorporating both the 'Instant' and 'Thinking' variations into ChatGPT as the new default for paying subscribers.

After the contentious release of GPT-5 earlier this year, the focus this time seems to be all about responsiveness, clarity, and flexibility when it comes to how the AI mimics human personalities.

GPT-5.1's approach to improving ChatGPT looks to encourage people to think about the AI chatbot as more than just a talking search bar. GPT‑5.1 Instant ...