OpenAI has unveiled GPT-5.1, a major update focused on improving reasoning, response quality, and conversational tone. The release includes two new variants: GPT-5.1 Instant, designed for faster and more natural interactions, and GPT-5.1 Thinking, which dynamically adjusts processing time based on task complexity. The update aims to deliver clearer, more reliable answers while offering a warmer and more intuitive user experience.
The company also introduced personality presets such as Friendly, Professional, and Quirky, giving users greater control over ChatGPT’s tone and communication style. GPT-5.1 initially rolls out to paid users, with broader availability planned over time.
The launch marks a strategic shift for OpenAI, prioritizing usability and real-world performance after mixed feedback on GPT-5. The focus is now on consistency, adaptability, and more human-aligned interaction rather than simply increasing model size.