OpenAI is releasing GPT-5.1 today, an update to the flagship model it released in August. OpenAI calls it an upgrade" to GPT-5 that makes ChatGPT smarter and more enjoyable to talk to." The new models include GPT-5.1 Instant and GPT-5.1 Thinking. The former is warmer, more intelligent, and better at following your instructions" than its [...]