OpenAI has released GPT-5.1, an enhanced version of ChatGPT that improves conversational tone, reasoning, and adherence to instructions. This update, arriving only three months post-GPT-5, features personality options like "friendly" and "quirky," allowing users to customize interactions. Notably, GPT-5.1 outperforms its predecessor in following specific prompts, crucial for structured tasks. The model automatically switches between Instant and Thinking modes while offering manual controls, marking significant usability advances for the AI.