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Just Now: ChatGPT's Free Model Upgraded — Hallucinations Halved, Memory Stronger, Answers More Concise

OpenAI has upgraded the default ChatGPT model to GPT-5.5 Instant, available to free users. Key improvements include a 52.5% reduction in hallucinations, a new 'memory source' feature, more concise answers, and a warmer, more natural tone. Sam Altman specifically encourages users who have been relying on deep thinking models to come back and try it.

Source量子位Author: 梦晨
Just Now: ChatGPT's Free Model Upgraded — Hallucinations Halved, Memory Stronger, Answers More Concise
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Key points

  • GPT-5.5 Instant becomes the new default model for ChatGPT, including free tier
  • Hallucination rate cut by 52.5%, especially in medical, legal, and financial domains
  • New 'memory source' shows which memories influenced the response; users can edit or delete them
  • Answers are more concise with fewer unnecessary follow-ups and emojis
  • Rolling out from May 5; paid users can still access the old model for 3 months

Highlights and analysis are generated automatically and may contain errors. Check the original source.

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