On May 22, 2025, Anthropic activated ASL-3 Deployment and Security Standards in conjunction with launching Claude Opus 4, as a precautionary and provisional action without having determined that Opus 4 definitively crossed the CBRN Capability Threshold requiring ASL-3.

supports (1)

• SActivating AI Safety Level 3 protections primary_testimony
  weight

  0.95

  locator: Opening paragraph and Rationale section

  “We are deploying Claude Opus 4 with our ASL-3 measures as a precautionary and provisional action. To be clear, we have not yet determined whether Claude Opus 4 has definitively passed the Capabilities Threshold that requires ASL-3 protections.”