By 2026, "hallucination rates" are practically meaningless without context....

https://blogfreely.net/weyladikle/the-myth-of-the-60-why-claude-opus-4-5-isnt-a-simple-accuracy-score

By 2026, "hallucination rates" are practically meaningless without context. Whether you are using the Vectara HHEM or the AA-Omniscience benchmark, you are measuring fundamentally different failure modes