OpenAI Switches ChatGPT Default Model to GPT-5.5 Instant, Reduces Hallucinations by 52.5%

According to OpenAI, the company switched ChatGPT's default model to GPT-5.5 Instant on May 8. In internal tests, the model produced 52.5% fewer hallucinated claims than GPT-5.3 Instant on high-stakes prompts, while reducing inaccurate claims by 37.3% in conversations flagged by users for factual errors. The update also improved image analysis, STEM question handling, and web search decision-making.
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