US Government Suspends Access to Anthropic's Fable 5 and Mythos 5
Original: Statement on US government directive to suspend access to Fable 5 and Mythos 5
Why This Matters
First known government export control on AI models over security concerns
The US government issued an export control directive requiring Anthropic to suspend access to its Fable 5 and Mythos 5 AI models for all foreign nationals, citing national security concerns over potential jailbreaking vulnerabilities.
Anthropic received a government directive at 5:21pm ET requiring immediate suspension of Fable 5 and Mythos 5 access for foreign nationals, including company employees. The government cited awareness of a jailbreaking method that could bypass model safeguards. Anthropic reviewed the demonstration and found it identified only minor, previously known vulnerabilities discoverable by other public models. The company maintains its defense-in-depth strategy includes strong safeguards tested for thousands of hours with government agencies and third parties. No universal jailbreaks have been found, though Anthropic acknowledges perfect jailbreak resistance is currently impossible. The company requires 30-day data retention for monitoring and states the disclosed jailbreaks are benign or provide no model-specific advantages.