Anthropic Customer Sues US Over Loss of Fable AI Access

An artificial intelligence startup, Legion, has filed a lawsuit against the U.S. government regarding a recent order that mandates Anthropic PBC to restrict access to its advanced AI models, Fable 5 and Mythos 5, for foreign nationals. This decision follows Anthropic's compliance with export control measures set by the Trump administration, which resulted in the disabling of access to these models. Legion, a U.S.-based company, claims that its development team includes Canadian nationals working remotely from Canada.

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By Rachel Metz

June 23, 2026 at 9:22 PM UTC

Updated on June 23, 2026 at 11:09 PM UTC

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An artificial intelligence startup that uses Anthropic PBC’s AI models sued the US over a government order that the maker of Claude and Mythos keep its most advanced technology out of the hands of foreign nationals.

The suit, filed Tuesday in federal court in Washington, comes less than two weeks after Anthropic disabled access to its most advanced AI models — Fable 5 and Mythos 5 — in response to the Trump administration’s export control. Legion, a litigation-technology company that builds tools for attorneys, is based in the US but said its software development employees include Canadian nationals who work from Canada.

Read Original at Bloomberg →