Anthropic was already navigating one dispute with the government in its standoff with the Pentagon, and then came an order on June 12th to block off foreign access to its most recently released AI models, Fable 5 and Mythos 5. When they launched on June 9th, Anthropic said “Fable 5’s capabilities exceed those of any model we’ve ever made generally available,” and that Claude Mythos 5 had the same underlying model, “but with the safeguards lifted in some areas.”
According to reports, the order came after conversations between Amazon and the White House about researchers saying they found ways to get Fable 5 to serve information that could be used in cyberattacks.
Anthropic responded by shutting access to both models for all customers, saying, “We are complying with the government’s legal directive and are removing access to Fable 5 and Mythos 5 for all users. However, we disagree that the finding of a narrow potential jailbreak should be cause for recalling a commercial model deployed to hundreds of millions of people.”
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Trump’s Anthropic shutdown just made the case for non-American AIAt Washington’s request, Anthropic suddenly took its newest and most powerful AI models offlineover the weekend. The American companysaidit had little choice after the White House demanded it block access for all foreign nationals, including its own employees. Abroad, the incident offered a sobering reminder that the US not only dominates frontier AI — its government also wields power over who gets to use it.The Trump administration’s action was swift, sweeping, and imposed with little warning or explanation. The unprecedented shutdown of the
Fable 5 and Mythos 5models — which were already subject tosafeguards limiting their usein “high-risk areas” — that followed gave new force to long-running arguments cautioning against relying on the US for critical technologies. It was fresh ammunition for the politicians, governments, and companies already arguing that they need to lead in the technology themselves.Read Article >China may have accessed MythosAccording to a new report from
, the White House’s decision to imposeSemaforexport restrictionson Anthropic’s Mythos was driven in part by fears that it had been accessed by a group linked to China. If the Chinese government actually had access to Mythos 5 or Fable 5, it would present a serious national security risk. The government could also attempt to reverse engineer the model throughdistillation, a method in which a “student” AI is trained on a more advanced model to replicate its behavior.The White House has not confirmed this report, and a post on X by Trump adviser
David Sacksdid not mention China. Instead, Sacks focused on a reported ability for Fable and Mythos to bejailbroken, something that Anthropic has denied. Anthropic has not replied to a request for comment, though a spokesperson toldSemaforthat the government did not bring up China during its discussions around export controls.Read Article >Amazon security research reportedly led to the White House’s Anthropic Fable banAccording to the
, the export control directive that led to AnthropicThe Wall Street Journalcutting off accessto Fable 5 and Mythos 5 was triggered in part by cybersecurity research from Amazon and conversations between CEO Andy Jassy and the White House. According to the report, the paper from Amazon claims that, through a series of prompts, it was able to getFable 5to serve up information that could be used in cyberattacks. Amazon has yet to respond to a request for comment.Shortly after Jassy shared the company’s findings with the government, it made the call to block its use by foreign nationals. Complicating this issue is that many of Anthropic’s researchers are foreign-born, meaning they were barred from accessing their own product.
Read Article >Anthropic cuts off Fable 5 and Mythos 5 access following government orderOn Friday evening, the government ordered Anthropic to block access to
Fable 5 and Mythos 5for all foreign nations, both inside and outside the US, due to national security concerns. That order included employees of Anthropic. To meet those demands, the company has completely cut off access to the models for all customers.In a
statement, Anthropic said that while it was complying with the order, the government “did not provide specific details of its national security concern.” Instead, it claims that any evidence of potential jailbreak was provided verbally, and that the vulnerabilities discovered were minor and available via other models, including GPT 5.5.Read Article >Anthropic releases its first Mythos-class model Claude FableAnthropic just
announcedClaude Fable 5, a new AI model it said is the most powerful model it has ever made widely available.According to the company, Fable 5 “shows exceptional performance in software engineering, knowledge work, and vision,” with its lead over other models growing as tasks become longer and more complex.