Hallucination rates depend on the benchmark. Vectara HHEM and AA-Omniscience...

https://online-wiki.win/index.php/Faithfulness_in_Summarization:_Why_%22Hallucination_Rate%22_is_a_Marketing_Myth

Hallucination rates depend on the benchmark. Vectara HHEM and AA-Omniscience reveal different failure modes. With $67.4B lost to bad data, stop trusting vendor averages. Demand testing that mirrors your unique, real-world operational risks