OPENAI RELEASES GPT-5.1 TO ALL CHATGPT USERS

Summary from the TLDR newsletter

OpenAI has released the GPT-5.1 family of models. GPT-5.1 Instant is a high-volume model that uses adaptive reasoning - it can decide when to think longer on hard prompts. GPT-5.1 Thinking can vary its deliberation for each question, so simple tasks are faster and complex work gets deeper analysis. GPT-5.1 Auto routes queries between models. ChatGPT has gained stronger personalization controls - users can now pick between different personalities.