AI & Machine Learning
Business Insiderabout 4 hours ago
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An AI startup is suing the US government for taking away Anthropic's new model

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Legal tech startup Legion sued the US government after a directive forced Anthropic to restrict access to its Fable 5 and Mythos 5 models, cutting off Legion's use of the tools.

An AI startup is suing the US government for taking away Anthropic's new model

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The Big Picture
Legion, a San Jose-based legal tech startup, filed a lawsuit in Washington, D.C. on Tuesday against the US government over a directive requiring Anthropic to bar foreign nationals from using its Fable 5 and Mythos 5 models. The directive, issued by the Trump administration, led Anthropic to initially disable access for all users, then restore it with nationality-based controls. Legion, which employs Canadian nationals working remotely from Canada, said it lost immediate access to Fable 5, which was integral to its AI-powered litigation drafting platform. The company claims the order caused 'immediate, irreparable, and existential' harm by hindering its ability to compete in the fast-moving AI space. This lawsuit adds to the ongoing clash between Anthropic and the government over AI safety and control of frontier models, and may be the first of many from affected customers.
Why It Matters
This lawsuit highlights the real-world consequences of government AI export controls, showing how restrictions on frontier models can disrupt entire business ecosystems built on top of them. For startups like Legion, losing access to cutting-edge AI tools isn't just an inconvenience—it can cause immediate, existential harm in a fast-moving market. The case also sets a precedent for how AI companies and their customers may push back against national security directives that limit model availability, potentially shaping future AI regulation and access policies.

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A laptop with Claude Code AI stickers.
A laptop with Claude Code AI stickers.
Anthropic's Claude Code has become one of the most popular AI coding tools.

Bloomberg/Getty Images

  • AI startup Legion sued the government over losing access to Anthropic's top AI models.
  • Legion said the directive harmed its business.
  • The lawsuit adds another layer to Anthropic's clash with the Trump administration.

One AI startup just sued the US government for cutting its access to Anthropic's top models.

On Tuesday, legal tech company Legion filed a suit in Washington, D.C. over a government order requiring Anthropic to keep its models Fable 5 and Mythos 5 away from foreign nationals.

Earlier this month, Anthropic said it would disable access to both models following a letter from the US government asking it to bar foreign individuals and entities from using the products. The AI lab said this rule would bar some Anthropic employees from using the tools. In order to comply, the company initially disabled access for everyone. Last week, Anthropic restored access to Claude Fable 5 with nationality-based access controls and enhanced onboarding compliance screening.

In Tuesday's complaint, Legion said that it was a US-based company that employs Canadian nationals who work remotely from Canada. It added that its litigation technology tools are built on top of frontier lab models, such as those from Anthropic.

"Legion is a commercial customer of Anthropic with a contractual right and license to access and use the Fable 5 model, which was integral to building and operating its platform," the company wrote in the filing. "When the directive took effect, Legion lost the latest tool at the center of its development instantaneously."

The company added that the order caused it "immediate, irreparable, and existential" harm against competitors because the pace of AI development is so rapid.

Legion, founded in 2024 and based in San Jose, develops AI-powered litigation drafting software that helps lawyers automate pleadings, discovery requests, and other court documents.

The Department of Commerce didn't immediately respond to Business Insider's request for comment.

Legion's lawsuit adds another set of stakeholders to Anthropic's clash with the Trump administration over AI safety and government control over frontier AI models. It may be the first among suits from Anthropic customers who have been complaining about losing access to its most powerful model.

When Anthropic first paused access to the model, it said that the government was concerned that someone might try a jailbreak of Fable 5. The company argued that cutting access for a "narrow potential jailbreak" was overkill and would halt all new model deployments.

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