ChatGPT — November 19, 2025

Changed

• GPT-5.1 Pro: Clearer, more capable answers for complex work
• Today we’re updating GPT-5 Pro to GPT-5.1 Pro. In early testing, users consistently preferred GPT-5.1 Pro over GPT-5 Pro, rating it especially highly for writing help, data science, and business questions. Testers highlighted the model’s improved clarity, relevance, and structure in its responses. GPT-5.1 Pro is rolling out today for all ChatGPT Pro users and is available in the model picker. GPT-5 Pro will remain available as a legacy model for 90 days before being retired.