Hallucination rates depend on the yardstick. Whether you measure via Vectara...

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

Hallucination rates depend on the yardstick. Whether you measure via Vectara HHEM or HalluHard—where models hit 30.2% failure—results vary wildly. In 2026, don’t ask if your AI is accurate; ask which benchmark fits your use case