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

https://penzu.com/p/56f67c1d518c153f

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