The Pentagon is already using Mythos
Anthropic says it believes the US government's export control order for Mythos 5 and Fable 5 is a "misunderstanding" and that it is working to restore access
Anthropic says it believes the US government's export control order for Mythos 5 and Fable 5 is a “misunderstanding” and that it is working to restore access — Anthropic said on Friday it has been ordered by the U.S. government to suspend access for all foreign nationals …

Anthropic says it is disabling Fable 5 and Mythos 5 for all customers
The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 …
the US Commerce Department decided
The Trump administration is blocking foreign governments, companies and individuals from accessing Anthropic's most advanced AI models.