GPQA-Bio (SecureBio)
Science
SecureBio's own runs of GPQA's 105-question biology subset, 85 molecular biology and 20 genetics questions with four options. Evaluated in Inspect with zero-shot prompting, usually over 10 runs. SecureBio doesn't state how refusals enter accuracy. Claude Opus 5.5 prints 90.9% with 36.3% 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