Anthropic reports 76.3% for Claude Mythos 5.2 on CyScenarioBench. Anthropic notes each lab's CyScenarioBench scores come from unique tasks.
Tasks: Cybersecurity scenarios; Anthropic says each lab's scores use unique tasks.
Setting: Highest-available effort, per the table footnote; the effort level is not named for this row. Numeric reasoning and token budgets are not stated.
Limits: Provider-reported by Anthropic in its launch announcement; not independently reproduced here. Anthropic points to the Fable 5.2 and Mythos 5.2 system card for methods; that card was not opened, so task subset, sample size, harness, prompts, trial counts and run dates are unverified. Results under the same benchmark name can be shown together as reported scores, but unmatched settings and missing methods rule out a controlled ranking. Anthropic says each lab's CyScenarioBench scores are based on unique tasks, so cross-lab comparisons are not like-for-like. No benchmark version is stated.
Anthropic
