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#ai-memory

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AI & Machine LearningMay 6, 202612 min
GPT-5.5 Instant: ChatGPT's New Default Model in 2026
OpenAI's GPT-5.5 Instant replaces GPT-5.3 as ChatGPT's default model on May 5, 2026, cutting hallucinations 52.5% on medicine, law, and finance prompts.

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GPT-5.5 Instant: ChatGPT's New Default Model in 2026