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

https://wiki-aero.win/index.php/Gemini_vs._Claude:_When_Should_You_Actually_Pick_Gemini%3F

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