ZDNET's key takeaways OpenAI's GPT-5.1 includes two brand-new models. Users can also choose from new personalities. The updates are meant to make ChatGPT more personalized. OpenAI updated ChatGPT with its highly-anticipated GPT-5 model over the summer,

OpenAI has launched ChatGPT 5.1 with more new personalities, speed, and improved instruction‐following. The update also introduces a split model with Instant and Thinking modes, giving the chatbot faster casual responses and more deliberate reasoning when needed.

OpenAI today upgraded GPT-5 to GPT-5.1, the next-generation version of the AI model that powers ChatGPT. There are two versions of GPT-5.1, including Instant and Thinking. Instant is warmer, more intelligent,

OpenAI launches GPT-5.1 Instant and Thinking, upgrades to its troubled GPT-5 flagship and adds more personalization features to ChatGPT.

OpenAI just released two GPT-5.1 AI models with new personality options, and they're rolling out first to paid ChatGPT users.

OpenAI (OPENAI) has released ChatGPT 5.1, which features GPT-5.1 Instant and GPT-5.1 Thinking to provide different types of communication styles dependent on the user and the query. GPT-5.1 Instant's communication style is "warmer by default and more conversational.

Back in August, OpenAI had introduced GPT-5, a significant frontier model update to ChatGPT. And now three months later, OpenAI

The release introduces two variants called GPT-5.1 Instant and GPT-5.1 Thinking. The former, which will replace GPT-5 as the default in ChatGPT, is said to be “warmer, more intelligent and better” at following user’s instructions than GPT-5.