VCT v2 (SecureBio)
Science
SecureBio's own runs of its revised Virology Capabilities Test, 279 multiple-response questions with text and images. Evaluated in Inspect with zero-shot prompting, usually over 10 runs. SecureBio doesn't state how refusals enter accuracy. Claude Opus 5.5 prints 60.5% with 81.5% refused, more than it could score if refusals counted as wrong, so accuracy appears to cover answered questions only and each model's denominator differs. These scores aren't comparable with other runs of the test, which is why this is a diagnostic.
Benchmark source: Securebio