Anthropic Put Mythos 5 Behind Claude Security's Vulnerability Scanner Instead of Handing Enterprises the Model

r/ClaudeAI (605 upvotes; primary: anthropic.com, corroborated by The New Stack and MarkTechPost)·high signalXBlueskyLinkedInCopy link

On 2026-08-21 Anthropic began running Claude Security vulnerability scans on Mythos 5, the cyber-capable model restricted to vetted defenders since April 2026, in public beta for Claude Enterprise customers with no separate model access and scans billed as normal token usage. The announcement also committed $35M in credits to an open-source defense fund and previewed an expanded Cyber Verification Program. r/ClaudeAI read the headline as Anthropic declassifying a dangerous model; the thread's top comments corrected it, the exposure is a constrained application surface that returns patches and alerts, not raw model access.