ChatGPT has just received a major upgrade with the launch of GPT-5.1, bringing enhanced customization and smarter, more conversational interactions. OpenAI highlights that this update aims to make the chatbot easier to tailor to individual users while improving its overall intelligence.
In a blog post, OpenAI introduced two new models within GPT-5.1: GPT-5.1 Instant and GPT-5.1 Thinking. The Instant model is designed to be “warmer and more intelligent,” excelling at following user instructions with a touch of playfulness in its responses. Meanwhile, the Thinking model focuses on advanced reasoning capabilities, offering a more thoughtful and empathetic interaction. Both models enhance ChatGPT’s ability to handle not only simple tasks with greater efficiency but also complex tasks with deeper understanding.
One key innovation is that GPT-5.1 Instant employs adaptive reasoning to decide when to pause and think before answering difficult questions. This approach helps maintain accuracy without slowing down the system unnecessarily.
Enhanced Customization Features
OpenAI is emphasizing personalization in this release. Users can now customize ChatGPT’s response style based on distinct personality types such as Candid, Quirky, Efficient, Professional, Friendly, and more. These personality settings apply consistently across all AI models, adding a new layer of tailored interaction. Notably, previous personality options like Nerdy and Cynical will still be available.
Looking ahead, OpenAI is exploring even more granular customization options reminiscent of the existing custom instructions feature. Although no details on the rumored ChatGPT group chat capability were provided, OpenAI confirmed that the Auto setting will continue to automatically select the best model for each task. For those who prefer a more neutral tone, the legacy models option allows access to GPT-5, similar to how GPT-4 remained accessible after GPT-5’s release.
Overall, GPT-5.1 represents a significant step forward in both AI capability and user experience, making ChatGPT more versatile and user-friendly than ever before.
