New Delhi, Nov. 13 -- OpenAI on Thursday, 13 November, rolled out its new GPT 5.1 models for ChatGPT, introducing two upgraded versions for users: GPT-5.1 Instant and GPT-5.1 Thinking. In its blog post, the Sam Altman-led company said these versions are "not only smarter but also enjoyable to talk to".

According to OpenAI, these models are designed to make it easier for a user to personalise their ChatGPT experience by adjusting the AI's tone and style. Users can now set preferences for how they want the chatbot to sound, enabling ChatGPT to better match their desired tone in conversations.

OpenAI described GPT‑5.1 Instant as "warmer" by default and more conversational. "Based on early testing, it often surprises people with its p...