U.S. Orders Anthropic to Suspend Fable 5 and Mythos 5 Access for Foreign Nationals

The U.S. government ordered Anthropic to suspend access to its advanced Claude Fable 5 and Mythos 5 models for foreign nationals due to national security concerns and a reported jailbreak vulnerability.

• •The company received an order to disable these models for foreign users citing a discovered jailbreak method.
• •Anthropic argues the discovered vulnerabilities are minor, publicly known, and present in other models as well.
• •Mythos 5 can convert newly disclosed vulnerabilities into working exploits within hours instead of weeks.
• •The company maintains no universal jailbreak has been successfully developed against its latest models.
• •Anthropic contends the government's decision should be based on transparent, fair, technical processes rather than a single narrow vulnerability.