Anthropic to disable Fable 5 and Mythos 5 globally after US govt export curbs

Anthropic, the makers of Claude, have announced that they will disable the two most powerful versions of the widely used AI Chabot, Fable 5 and Mythos 5, following an order from the Trump administration to suspend foreign nationals from using the two most advanced models.

Access to be suspended worldwide

The AI giant, in a statement on Friday (June 12), also said that the US Government had yet to identify any specific issues related to the two models, which the company described as “two powerful” before their launches.

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“The US government, citing national security authorities, has issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees,” stated Anthropic.

“The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance. Access to all other Anthropic models will not be affected,” it added.

Elaborating further, the company stated that it seems that the US government has come across “a method of bypassing, or 'jailbreaking' Fable 5.”

Jailbreak concerns cited

“We reviewed a demonstration of this specific technique being used to identify a small number of previously known, minor vulnerabilities. These vulnerabilities all appear relatively simple, and we have found that other publicly-available models are able to discover them as well without requiring a bypass,” it added.

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Prior to the public launch of Claude Fable 5, Anthropic highlighted a series of safeguards designed to reduce the risk of the model being used for cyber intrusions and other malicious activities.

Concern among stakeholders

The rollout drew attention from finance, technology and government stakeholders, many of whom had raised concerns after the model was made available to a limited group of users in April for testing and vulnerability assessments.

Anthropic said only a small number of organisations were granted early access because of the model's advanced capabilities and its potential ability to identify and exploit weaknesses in computer systems.

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Before releasing the model, the company described it as being "too powerful to release", a claim that attracted criticism from some observers who viewed it as a marketing tactic.

"Fable's capabilities exceed those of any model we've ever made generally available," the company said.

Legal battle with administration

Anthropic is also engaged in a separate legal dispute with the Trump administration over restrictions on the use of its AI products by government agencies. The company has faced increasing scrutiny from the administration, with Donald Trump criticising Anthropic publicly and US Defence Secretary Pete Hegseth designating it a "supply chain risk".

Anthropic subsequently challenged the designation in court, and a judge ruled that the Pentagon's order could not be enforced while the case remains ongoing.