AI hallucination rates shift wildly depending on which benchmark you choose to...

https://sierra-wiki.win/index.php/Claude_4.1_Opus_Shows_0%25_Hallucination:_Real_Progress_or_Just_a_Refusal_Tax%3F

AI hallucination rates shift wildly depending on which benchmark you choose to trust. With 362 reported incidents in 2025 alone, it is clear that generic vendor claims just do not hold up. We evaluate the 2026 landscape to find what actually works.