Anthropic opens Mythos 5 to vulnerability scanning via Claude Security

Anthropic announced the vulnerability-scanning availability of Claude Mythos 5 as part of a broader strategy to distribute its most powerful model while managing misuse risk. Since April, the company has operated Project Glasswing, providing early access to Claude Mythos Preview and Mythos 5 to a select group of organizations defending critical infrastructure. By August 21, Anthropic moved to expand access through Claude Security—a service that scans code repositories, detects vulnerabilities, and proposes patches. The core insight is that the model poses the least risk when users cannot interact with it directly but instead receive constrained outputs (detection results, fix suggestions, patches). Anthropic frames this as a way to let defenders benefit from Mythos 5's capability without exposing the model to adversaries. The company is reinforcing this approach through partnerships with security vendors, who will integrate Mythos 5 into their own products so end users never handle the model directly. Simultaneously, the Defender Advantage Fund ($35 million) and the Cyber Verification Program expansion signal Anthropic's intention to position Mythos 5 as infrastructure for the defensive security community, not as a general-purpose API.