ChatGPT’s default model has been updated to GPT-5.5 Instant, a model that brings accuracy improvements with fewer hallucinations, especially in fields like medicine, law and finance, according to OpenAI.
GPT-5.5 Instant performs better for tasks like analyzing images, answering STEM questions, and deciding when to use web search to provide a better answer. Replies can also be personalized as GPT-5.5 Instant can better pull context from past chats, files, and Gmail, but this is currently limited to paid subscribers.
OpenAI claims that responses are “more precise and precise without losing substance” and without eliminating ChatGPT’s personality. It will provide the same information, but without unnecessary formatting, emojis, and follow-up questions.
All ChatGPT models are updated with memory sources, which will show users the past chats, files, and other context that ChatGPT used to generate a response.
GPT-5.5 Instant is rolling out to all ChatGPT users today and replaces GPT-5.3 Instant as the default model. Although free users can access GPT-5.5 Instant, the new customization features are limited to Plus and Pro users on the web. Personalization will soon extend to mobile and will be rolled out to Free, Go, Business and Enterprise users in the coming weeks.
It is not yet clear when Apple Intelligence’s ChatGPT integration will move to GPT-5.5 Instant.