US Government Order Forces Immediate Shutdown of Anthropic's Fable 5 and Mythos 5 Models
The US government has issued an order that has forced the immediate shutdown of Anthropic's Fable 5 and Mythos 5 models, citing national security concerns and risks of bypassing AI protection systems.
Background
According to a statement released by the company on June 12, 2026, a directive from the US authorities has been issued, imposing the suspension of all access to these models for foreign individuals, including non-American employees of the company, whether in the US or abroad. Due to this legal obligation, Anthropic has indicated that it must completely disable Fable 5 and Mythos 5 for all its clients. The company's other models are not affected by this measure.
Government Notification
The government notification, received at 5:21 PM (Eastern Time), did not provide specific reasons related to national security. According to Anthropic's interpretation, the authorities have identified a method to bypass Fable 5's protections, a phenomenon known in the industry as a "jailbreak." This technique would have revealed certain known vulnerabilities, which the company considers minor and also detectable by other public models.
Anthropic's Response
In its statement, Anthropic defends the robustness of the safeguards integrated into Fable 5. The company claims to have implemented enhanced protections to limit sensitive uses, particularly in cybersecurity. Before its launch, the model was subjected to thousands of hours of testing and audits conducted with public and private partners, including American and British security agencies. These evaluations did not identify a "universal jailbreak" capable of widely bypassing the system's protections.
Industry-Wide Challenges
Anthropic acknowledges that perfect resistance to these bypassing methods does not currently exist in the AI industry. The company claims to have a "defense in depth" strategy, combining abuse limitation, suspicious behavior detection, and continuous monitoring. Anthropic also emphasizes that the observed risks are comparable to those of other models already deployed on the market.
Next Steps
In the short term, the company affirms that it will comply with the regulatory decision while contesting its interpretation. Anthropic indicates that it is working to restore access to its services as soon as possible.
