Statement on the US government directive to suspend access to Fable 5 and Mythos 5
Anthropic News · 2026-06-12
Anthropic's official statement confirms compliance with a US government export control directive suspending Fable 5 and Mythos 5 for all foreign nationals, while publicly contesting the directive as technically unfounded and warning it sets a precedent that would halt all frontier model deployments industry-wide.
Appears in
Extraction
Topics: ai-regulationexport-controlsgovernment-ai-policyanthropic-fableai-governance
Claims
- The US government issued an export control directive suspending Fable 5 and Mythos 5 for all foreign nationals without providing specific details of its national security concern.
- Anthropic's review found the demonstrated jailbreak consists of asking the model to read a codebase and fix flaws, a capability widely available from other models including GPT-5.5 with no Mythos-specific uplift.
- Anthropic's pre-launch defense-in-depth strategy included thousands of hours of red-teaming with government and private organizations, yielding no universal jailbreak.
- The 30-day data retention requirement for Fable users was specifically designed to enable rapid detection and mitigation of successful jailbreak attempts.
- Anthropic argues applying this recall standard across the industry would essentially halt all new frontier model deployments by every provider.
Key quotes
We disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people.
If this standard was applied across the industry, we believe it would essentially halt all new model deployments for all frontier model providers.
We believe the government should have the ability to block unsafe deployments, as part of a statutory process that is transparent, fair, clear, and grounded in technical facts. This action does not adhere to those principles.