ChatGPT Updates to GPT-5.5 Instant for Improved Accuracy and Personalization

ChatGPT's default model has been updated to GPT-5.5 Instant, which aims to deliver smarter and more accurate responses.

The update includes a 52.5% reduction in hallucinated claims compared to the previous model, particularly in high-stakes areas like medicine, law, and finance.

Improvements also extend to everyday tasks, including better handling of photo uploads and STEM-related questions, as well as more effective use of web searches.

The model's responses are now more concise, reducing unnecessary verbosity and follow-up questions, while maintaining a friendly tone.

Enhanced personalization features allow the model to utilize context from past interactions, making responses feel more relevant to users.

GPT-5.5 Instant is being rolled out to all users, replacing the previous GPT-5.3 Instant model, which will remain available for three months for paid users before being retired.