GPT‑5.5 Instant

GPT-5.5 Instant is an AI chatbot model that serves as ChatGPT's default model for everyday conversational answers, for ChatGPT users on all plans. It replaces GPT-5.3 as the default and is positioned to give smarter, more concise answers than the model it succeeds. The release adds improved personalization that draws on your past chats and a connected Gmail account, plus memory source controls so you can manage what the model remembers and references. Because it ships as ChatGPT's built-in default, you use it inside the existing ChatGPT product rather than installing anything separate, and access is available across all plan tiers. OpenAI launched it in May 2026. No standalone pricing is published for the model itself; usage follows ChatGPT's existing free and paid subscription tiers. As an AI chatbot model, GPT-5.5 Instant suits ChatGPT users who want the current default to handle general questions, writing, and quick reasoning with more personalized responses.

People use GPT-5.5 Instant as ChatGPT's default model for everyday questions, writing, and quick reasoning with personalized answers.