GPT-5.1
Upgraded GPT-5 models in ChatGPT with new tone and style controls, rolling out to paid users.
We’re upgrading the GPT-5 series with warmer, more capable models and new ways to customize ChatGPT’s tone and style. GPT-5.1 starts rolling out today to paid users.
Official source
GPT-5.1: A smarter, more conversational ChatGPTopenai.com · published