GPT‑5.5 Instant
Smarter, more personal answers as ChatGPT's new default
What is GPT‑5.5 Instant?
GPT-5.5 Instant replaces GPT-5.3 as ChatGPT's default model with smarter, more concise answers, improved personalization from past chats and connected Gmail, and memory source controls. For ChatGPT users on all plans.
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