Claude Sonnet 5: how it does on security work, and what it will answer

What happened

$2 and $10 per million tokens with a 1M window. RealVuln scored it F3 43.3 across all 140 repositories at 52.65% precision and 42.48% recall for $130.67, and its classifier blocks 3.2% of defensive discovery requests and flags 0.52% of benign traffic.

RealVuln 3.1.0, F3 (micro): 43.3 (independent; Claude Code agentic harness (claude-sonnet-5-cc-agentic-v1), prompt sha256:45a1200d61e6; 140 of 140 repositories pinned by commit SHA (full corpus, TypeScript and JavaScript included); safeguards: production safeguards as deployed on the API; run 2026-09-11; CONFIRMED). strict F3 43.3; precision 52.65%, recall 42.48%; $130.67 for the run; $0.0176 per 100 lines; 230.0s wall clock a run; reasoning effort high. Refusal gate (CONFIRMED, observed 2026-09-11): Real-time cyber safeguards; the Cyber Verification Programme lifts the dual-use tier. the four Anthropic blocked and flagged rates rest on two independent readings of the Fable 5.1 and Mythos 5.1 system card, which this desk has not opened.