ChatGPT's New Default Model Is More Factual And Better At Personalization

OpenAI made GPT-5.5 Instant the default ChatGPT model.

The update aims to cut hallucinations, answer more directly, and ask fewer follow-up questions or use fewer emojis.

ChatGPT should also personalize responses better by using context from uploaded files, Gmail, and chat history.

OpenAI added memory sources, showing what context may have informed an answer and letting users edit or delete it.