A June government order forced Anthropic to take its Fable 5 and Mythos 5 AI models offline for 18 days, highlighting a lack of standardized federal procedures for AI security.
Key facts
- •Anthropic's Fable 5 and Mythos 5 models were offline from June 12 to June 30, 2026.
- •The shutdown was triggered after Amazon researchers reported a method to bypass the models' guardrails.
- •The Pentagon previously labeled Anthropic a supply chain risk in March 2026.
- •Legion LegalTech's lawsuit argues the government's directive exceeds existing statutory authority.
- •Proponents suggest using the Center for AI Standards and Innovation as a foundation for a new, independent regulatory body.
In June 2026, the U.S. Commerce Department ordered Anthropic to restrict access to its Fable 5 and Mythos 5 AI models, leading the company to shut them down globally for 18 days. The directive followed reports from Amazon researchers regarding potential model security flaws. The incident has sparked debate over the lack of a formal, transparent federal process for evaluating AI security risks and imposing proportionate remedies.
The June Shutdown and Legal Challenges
On June 12, Secretary of Commerce Howard Lutnick issued a letter requiring a license for providing the models to any foreign person, a move that effectively forced a global shutdown. Anthropic stated the letter lacked specific details regarding the national security concerns. On June 23, customer Legion LegalTech filed a lawsuit challenging the government's authority to issue the directive, citing the Export Control Reform Act and the International Emergency Economic Powers Act.
Proposed Regulatory Framework
Critics of the current approach argue that the government relies on opaque, ad-hoc methods vulnerable to political influence. Proposals for reform include creating a statutory AI security review agency with the authority to conduct 30-day pre-release reviews and 72-hour emergency assessments. Such a system would aim to provide a structured alternative to binary choices like total shutdowns, offering proportionate responses such as mandatory patching or enhanced logging.
Timeline
- March 2026The Pentagon labeled Anthropic a supply chain risk.
- June 12, 2026The Commerce Department ordered Anthropic to restrict access to its models, leading to a global shutdown.
- June 23, 2026Legion LegalTech filed a lawsuit challenging the government's directive.
- June 30, 2026Public access to the Fable 5 model was restored.
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This article was independently rewritten by ManyPress editorial AI from reporting originally published by War on the Rocks.
