US lets Anthropic redeploy Mythos 5 to critical-infrastructure orgs

Anthropic says the US government has cleared it to redeploy Mythos 5, its strongest cybersecurity model, to a set of US organizations that operate and defend critical infrastructure. It is the first easing after both Mythos 5 and Fable 5 were forced offline for all customers.

Key points

• On June 12, the US government cited national security and issued an export-control directive barring all access to Fable 5 and Mythos 5 by foreign nationals; Anthropic disabled both models for every customer to comply.
• The government has now notified Anthropic that Mythos 5 may be used again, limited to US critical-infrastructure organizations.
• Fable 5 — the broadly available sibling, built on the same foundation but with stronger guardrails — is not yet permitted to return.
• Anthropic says it continues discussions with the government to restore Fable 5; access to its other models was unaffected.