CVP and LSVP — not a public API toggle

Confirmed on Anthropic’s page: Cyber Verification Program and Life Sciences Verification Program gate Mythos 5.1; Claude Security also moves onto Mythos.

1 Sep 2026 · anthropic.com

• Anthropic says Mythos 5.1 offers more permissive safeguards for vetted cyber and life-sciences work via the Cyber Verification Program (CVP) and Life Sciences Verification Program (LSVP).
• Anthropic states LSVP was developed in partnership with the US government, with first participants enrolled and broader life-sciences enrollment planned; Claude Security is now powered by Mythos 5.1.

Why it mattersCapability without an enrollment path is not a ship for most readers.