In 2026, no single hallucination score exists. Relying on generic metrics...

https://blogfreely.net/weyladikle/the-myth-of-the-60-why-claude-opus-4-5-isnt-a-simple-accuracy-score

In 2026, no single hallucination score exists. Relying on generic metrics leaves you flying blind. Testing against HalluHard might show a 30.2% error rate, while Vectara HHEM offers a different lens