Anthropic blocks all public access to Claude Fable 5, Mythos 5 following US government order — what enterprises should do

Anthropic suspended all public and internal access to Claude Fable 5 and Claude Mythos 5 after a US government directive cited unspecified national security authorities. The move affects enterprise customers globally, rerouting requests to older models, and follows reports of a viral jailbreak that allegedly bypassed the models’ safeguards.

The incident highlights a major operational risk for companies relying on centralized frontier AI services: access can be disrupted instantly by regulation or vendor compliance. Enterprises should diversify model providers, maintain fallback systems, and reassess whether sensitive workflows require more controllable AI infrastructure.