Legion sues U.S. over lost access to Anthropic models

Legion, a U.S. legal-technology company that builds AI-powered drafting tools for attorneys - its product drafts pleadings, discovery, and motions from uploaded case documents - sued the federal government in Washington, D.C., federal court over a June 12 directive that Reuters reports was issued by the U.S. Commerce Department's Bureau of Industry and Security and that required Anthropic to disable access for "any foreign national" to its most advanced models. Reuters reports that Anthropic turned off access to its Fable 5 and Mythos 5 models the same day to ensure compliance. Fable 5 had been publicly available for approximately three days - Gizmodo reports Anthropic released it on June 9 and removed it on June 12 - before the directive forced a shutdown. Gizmodo, citing reporting by The Wall Street Journal and The Information, reports that Amazon researchers found workarounds to Fable 5's safeguards and that this finding was shared with the U.S. government, contributing to the export control order. Bloomberg reports that Legion said the shutdown cut off access for Canada-based members of its software team. Reuters quotes the company filing that "The harm to Legion is immediate, irreparable, and existential." Reuters also reports that Legion asked a judge to vacate the directive and to issue a preliminary order barring enforcement. Reuters notes Anthropic is not a party to the litigation, and Anthropic referred to a prior statement thanking the administration for partnership as it works to resolve the matter.

Anthropic, in its official public statement on the directive, says the government believes it has become aware of a method of bypassing, or "jailbreaking," Fable 5. Anthropic describes the disclosed potential jailbreak as "essentially consisting of asking the model to read a specific codebase and fix any software flaws," and states it reviewed the technique and found "the level of capability displayed there is widely available from other models (including OpenAI's GPT-5.5)." Anthropic says the directive required it to suspend access for all customers - not just foreign nationals - because implementing a nationality-verification scheme at the scale of its user base was impractical. Anthropic confirmed that access to all other Anthropic models was unaffected. The affected models, Fable 5 and Mythos 5, are the most advanced, consumer-facing versions of Claude and Mythos technology in public reporting.

Legal disputes and export-control enforcement intersecting with model availability create operational risk for companies that depend on externally hosted frontier models. Companies that rely on third-party, high-capability models and have distributed development teams commonly face immediate disruption when an access cutoff affects developer accounts across borders, as Reuters and Bloomberg document in this case. For downstream users, intermittent access to frontier models can cause product delays, engineering idle time, and competitive disadvantage while legal and regulatory issues are resolved.

Observers should follow: court filings and scheduling for Legion's preliminary injunction request (Reuters), any further statements or filings by Anthropic in the separate lawsuits it has with the administration (Reuters), and whether the Commerce Department or Bureau of Industry and Security issues clarifying guidance on how the directive applies to multinational developer teams (Bloomberg, Reuters). Also monitor customer notices from model providers about access rules and account controls during compliance actions.

Legion's lawsuit is quoted in Reuters saying the disruption is "immediate, irreparable, and existential." Bloomberg quotes Legion CEO Arthur Rothrock saying, "Who's to say they can't do this any other time against another company, like OpenAI?" Anthropic, in its official public statement, says it disagrees "that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people," and adds it is "working to restore access as soon as possible." Reuters reports that Anthropic is not a party to the suit and has directed readers to a prior statement thanking the administration for partnership.

Public reporting does not include internal government communications beyond what appears in court filings and formal statements. The jailbreak technique, and whether it provides meaningful security uplift beyond existing public models, is disputed between Anthropic and the government per Anthropic's statement. Bloomberg and Reuters are behind paywalls; key quotes are drawn from search snippets and Gizmodo's reporting on the filings.