Anthropic expands Cyber Verification Program with access to Claude Mythos 5.1, Opus 5.5, and Sonnet 5.5

Anthropic is expanding its [Cyber Verification Program](https://www.anthropic.com/news/cyber-verification-program) to give verified security professionals access to Claude Mythos 5.1, Opus 5.5, and Sonnet 5.5, configured with safeguards intended for defensive tasks.

The expansion also adds new tiers permitting authorized offensive security work, including penetration testing and red-teaming.