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ChatGPT update rolls out GPT-5.5 Instant with fewer hallucinations and more personalized answers

OpenAI is swapping out ChatGPT's default model for GPT-5.5 Instant. In internal testing, the update produced 52.5 percent fewer hallucinated claims on high-risk topics like medicine and law. A new feature called "memory sources" lets users see which stored context shaped a given response. The model is rolling out to all ChatGPT users right away, though personalization based on past chats, files, and Gmail launches first for Plus and Pro users on the web.

SourceThe DecoderAuthor: Matthias Bastian
ChatGPT update rolls out GPT-5.5 Instant with fewer hallucinations and more personalized answers
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  • OpenAI is replacing ChatGPT's default model with GPT-5.5 Instant, which shows 52.5% fewer hallucinations on high-risk topics like medicine, law, and finance, along with strong benchmark gains in math, science, and visual reasoning.
  • A new "memory sources" feature now shows users which personal context—past chats, saved reminders, or uploaded files—informed a given response, with the ability to correct or remove individual entries.
  • GPT-5.5 Instant is rolling out to all ChatGPT users right away, though advanced personalization via past chats, files, and Gmail is initially limited to Plus and Pro subscribers, with wider availability coming in the following weeks.

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