GPT-6.1 Terra cuts hallucination rate by 50 points while lifting accuracy 2 points
ArtificialAnlys · x · 2026-10-27
Artificial Analysis data shows GPT-6.1 Terra drops its hallucination rate by 50 points on the AA-Omniscience benchmark while raising accuracy by 2 points — answering more questions correctly while admitting ignorance more often.
The charts also compare rivals: Gemini 4 Argon has the lowest hallucination rate (15%), Claude Opus 5.5 the highest accuracy (67%), while GPT-6 Luna Preview hallucinates a staggering 88% of the time.
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