OpenAI Launches GPT‑5.1: Smarter, Warmer ChatGPT With New Personalities and Faster Reasoning — Rolling Out Today (Nov 12, 2025)
OpenAI launched GPT-5.1 today, introducing two models—Instant and Thinking—with adaptive reasoning and improved math and coding performance. New personalization features let users pick and fine-tune ChatGPT’s personality and response style, with changes applying instantly across chats. The update rolls out first to paid users, then to free and enterprise tiers. Older GPT-5 remains available for three months during the transition.