We Tested GPT-5.1 in ChatGPT: The Good, the Bad, and the Unexpected

GPT 5.1 arrives just months after GPT 5, offering a warmer tone, faster responses, and adaptive reasoning that lets the model decide when to think before replying. Testing shows smoother flow, clearer explanations, and better instruction adherence. Conversations feel friendlier, and writing is more human, though the model still leans heavily on bullet points. Accuracy is improved but not flawless, and domain-specific queries still require caution.