OpenAI launches GPT-5.5 Instant, which it says is smarter, with more accurate and personalized responses, replacing GPT-5.3 Instant as ChatGPT's default model (OpenAI)

OpenAI : OpenAI launches GPT-5.5 Instant, which it says is smarter, with more accurate and personalized responses, replacing GPT-5.3 Instant as ChatGPT's default model — We're updating ChatGPT's default model, available to everyone, to be smarter and more accurate, with clearer, more concise answers that feel better tailored to you.

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