ChatGPT Quietly Launched GPT 5.1

Nov 22, 2025 · 3 min read · OpenAI Quietly Launches GPT 5.1—Here's What Changed OpenAI rolled out GPT 5.1 to ChatGPT users in mid-November 2025 without much fanfare. The update brings substantial improvements in reasoning, speed, personality controls, and coding—making ChatGPT ...