By 2026, measuring hallucination is less about "truth" and more about the test...

https://highstylife.com/is-multi-model-checking-worth-it-if-gemini-gets-contradicted-51-4-of-the-time/

By 2026, measuring hallucination is less about "truth" and more about the test you pick. Whether you use Vectara HHEM to audit retrieval or TruthfulQA for general reasoning, results vary wildly based on your specific domain