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Jun 3, 2026 · Artificial Intelligence

GPT‑5.5 Instant Goes Free: Hallucinations Cut 52%, Math Scores Jump to 81%, and Personalized Memory Arrives

OpenAI has rolled out GPT‑5.5 Instant as the new default ChatGPT model, delivering 52.5% fewer hallucinations, a rise in math benchmark scores from 65% to 81%, 30% shorter replies, and a memory system that surfaces past context for personalized answers, all available for free to every user.