OpenAI Launches GPT‑5.1: Smarter, Warmer ChatGPT With New Personalities and Faster Reasoning — Rolling Out Today (Nov 12, 2025)
OpenAI is refreshing the ChatGPT experience with a model upgrade and new personalization controls that land today. November 12, 2025 — OpenAI has released GPT‑5.1, an update to the GPT‑5 series that pairs a friendlier, more natural ChatGPT with clearer reasoning. The rollout includes two models—GPT‑5.1 Instant and GPT‑5.1 Thinking—and begins today, with availability expanding over the next few days. OpenAI What’s actually new in the models GPT‑5.1 Instant now uses adaptive reasoning to decide when to “think” before answering harder questions, improves instruction following, and aims for a warmer baseline tone. OpenAI also reports stronger performance on math and