In 2026, there is no single "hallucination score." Reliability depends entirely...

https://hotel-wiki.win/index.php/Beyond_the_Headline:_Why_GPT-4o%E2%80%99s_64.4%25_Accuracy_Drop_Matters_for_Your_RAG_System

In 2026, there is no single "hallucination score." Reliability depends entirely on your chosen benchmark. Comparing Vectara HHEM against AA-Omniscience reveals how differently models handle grounded reasoning versus raw creative generation