OpenAI Releases GPT-5.5 Instant as ChatGPT's New Default Model
OpenAI replaced GPT-5.3 Instant with GPT-5.5 Instant as the default ChatGPT model for all users, reporting a 52.5% reduction in hallucinated claims in internal evaluations. The update prioritizes factual accuracy in high-stakes domains including law, medicine, and finance, while also delivering more concise and personalized responses.
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