Legion sues U.S. government over loss of Anthropic's Fable 5 model

Legion, an AI-powered legal document startup, filed a lawsuit against the U.S. government after an export control directive forced Anthropic to pull its Claude Fable 5 model just three days after its June 9 release. Legion claims the directive, which required Anthropic to restrict access to U.S. nationals only, crippled its operations. The startup's CEO Arthur Rothrock stated, 'Each day the directive remains in force disrupts Legion’s product, operations, sidelines its engineers, and erodes the company’s ability to survive.' Legion's staff includes Canadian nationals in Canada, making them unable to access the model.

Fable 5 was the most advanced, consumer-facing version of Claude, part of the same class as the earlier Mythos Preview model, which Anthropic had deemed too dangerous for public release. Shortly after Fable 5's release, the U.S. government learned that Amazon researchers had found workarounds bypassing its safeguards. Combined with previous concerns that China-connected entities had accessed Mythos, the government issued the export control order. Rather than implement a complex citizenship-verification system, Anthropic pulled the plug. The company expressed gratitude to the administration and remains committed to working with the government on AI leadership and critical infrastructure protection.