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GPT-5.5 Instant release and hallucination claims
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OpenAI released GPT-5.5 Instant as the new default ChatGPT model on May 5, 2026, claiming it reduces hallucinations by 52.5% on high-stakes prompts in medicine, law, and finance compared to GPT-5.3 Instant, while maintaining low latency. The company also reported a 37.3% reduction in inaccurate claims on user-flagged challenging conversations.
- GPT-5.5 Instant launched as ChatGPT's new default model on May 5, 2026
- 52.5% fewer hallucinated claims on high-stakes prompts in medicine, law, and finance versus GPT-5.3 Instant
- 37.3% reduction in inaccurate claims on user-flagged challenging conversations
- Improvements based on OpenAI's internal evaluations
- Model maintains low latency of its predecessor