AI Startup Legion Files Lawsuit Against U.S. Government
Legion, an emerging AI startup, has taken the unprecedented step of suing the federal government for revoking its access to Anthropic’s premier AI models.
- According to Legion, this government mandate has inflicted substantial damage on its business operations.
- The lawsuit further complicates the ongoing conflict between Anthropic and the Trump administration.
On Tuesday, legal technology firm Legion initiated legal proceedings in Washington, D.C., following a directive compelling Anthropic to restrict its models, Fable 5 and Mythos 5, from foreign nationals.
Earlier this month, Anthropic announced the disabling of access to these models in response to a directive from the U.S. government mandating that foreign individuals and entities be barred from using its products.
The AI laboratory contended that this restriction would prevent several of its employees from utilizing the models.
To comply, Anthropic initially revoked access for all users, but subsequently reinstated access to Claude Fable 5, implementing national eligibility criteria and more stringent onboarding compliance checks.
In its legal filing, Legion expressed that it operates as a U.S.-based enterprise employing Canadian nationals who work remotely from Canada.
The firm underscored that its litigation technology is predicated upon state-of-the-art frontier lab models, notably those provided by Anthropic.
“Legion holds a commercial contract with Anthropic granting it the right and license to utilize the Fable 5 model, which is crucial for its platform’s development and operation,” the company asserted in its complaint.
“Upon the implementation of the directive, Legion was abruptly deprived of a pivotal resource central to its innovation.”
The complaint further stated that this order has inflicted “immediate, irreparable, and existential” harm against competitors, given the rapid pace of advancements in AI technology.
Founded in 2024 and headquartered in San Jose, Legion specializes in AI-driven legal drafting software assisting attorneys in automating pleadings, discovery requests, and various court documents. Currently, the company boasts a modest workforce of fewer than ten employees as per LinkedIn.
The Department of Commerce has yet to issue a response regarding this lawsuit.
This litigation marks an introduction of new stakeholders into the ongoing dispute surrounding AI safety and governmental oversight of sophisticated AI models between Anthropic and the Trump administration.
It could represent a pioneering instance of legal actions from Anthropic clients expressing grievances about diminished access to its most advanced model.
When Anthropic initially restricted access to the model, they indicated that the government expressed concerns regarding a potential attempt to exploit a vulnerability in Fable 5.

The company contended that limiting access due to a “narrow potential jailbreak” was excessive and would impede all future model releases.
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