Partially Verified70% confidenceFactTime unknown
OpenAI upgraded ChatGPT's default model to GPT 5.5 Instant, which reduced hallucinations by 52.5% compared to its predecessor in internal testing.
4
Sources
70%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026
Sources
Related Claims
UnverifiedInformation about GPT 5.5 Instant's hallucination improvements was disclosed by TechChange, The Word, and other media outlets75% similarUnverifiedGPT 5.5 Instant significantly reduces the probability of hallucinations when handling complex logical reasoning in sensitive domains compared to its predecessors75% similarUnverifiedGPT 5.5 Instant has roughly halved its hallucination rate in medical and legal domains compared to its predecessor.73% similarPartially VerifiedOpenAI quietly launched GPT 5.5 Instant, replacing GPT 5.3 Instant as ChatGPT's default model and making it available to all users.72% similarUnverifiedOpenAI推出了GPT 5.3 Instant模型，主要改进在于减少塑造式对话风格，对话更自然流畅72% similar
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