GPT-5.3 Instant reduces hallucinations by 26.8% on web queries and 19.7% on internal knowledge — OpenAI's most-used model now prioritizes accuracy and fewer refusals over raw performance gains.
OpenAI has released GPT-5.3 Instant, a ChatGPT update delivering 27% fewer hallucinations, a less preachy tone, and improved everyday usability.
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