Anthropic pulled powerful AI models offline after U.S. export control order over security fears

Reviewed byNidhi Govil

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The Trump administration ordered Anthropic to restrict access to its Fable 5 and Mythos 5 AI models, citing national security concerns over their cybersecurity capabilities. The company responded by taking both models completely offline. Experts warn that similar AI capabilities will emerge from competitors regardless, and that export controls may hurt defenders more than attackers.

Anthropic Shuts Down AI Models Following Government Order

Anthropic took its Claude Fable 5 and Mythos 5 AI models offline last week after receiving a U.S. government export-control directive barring "any foreign national" from accessing the services

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. The Trump administration restrictions came just days after Fable 5's June 9 release, forcing the company to disable both models for all customers within roughly 90 minutes of notification

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. The company has been negotiating with the White House since Friday but has yet to secure an agreement to reinstate the offerings

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Source: ET

Source: ET

The directive represents the first real test of whether export control can contain frontier AI models with advanced dual-use capabilities. Two incidents reportedly triggered the ban: Anthropic granted access to Mythos through its limited partner program to SK Telecom, a South Korean company that U.S. officials suspected had ties to China, though the company has denied any China connection

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. Additionally, Amazon CEO Andy Jassy alerted the administration after Amazon researchers reportedly found a way around Fable 5's safeguards, though Anthropic disputes the "jailbreak" label, calling it a narrow, already-patched issue

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Advanced Cybersecurity Capabilities Spark National Security Concerns

Since Mythos debuted in April, Anthropic has warned that the model possesses advanced capabilities for both finding software vulnerabilities to help defenders patch them and figuring out ways to exploit them that could be used by bad actors

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. The company initially released Mythos Preview to a select consortium as part of Project Glasswing, with only around 150 vetted companies and government organizations having access

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Source: MediaNama

Source: MediaNama

Claude Fable 5, a Mythos-grade model, was released to the general public with specific blocks on its ability to respond to questions about biology and cybersecurity tasks

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. However, the Trump administration moved to restrict both models because it believes Fable 5's guardrails can be disabled to allow full access to Mythos 5 capabilities, allegedly making it a national security risk

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Mozilla's Firefox team used Claude Mythos Preview to identify 271 vulnerabilities that were later fixed in Firefox 150, while earlier work with Anthropic's Opus 4.6 helped uncover 22 security-sensitive bugs in Firefox 148

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. Cloudflare tested Mythos against live code in critical infrastructure, where the model could chain lower-severity bugs and generate proof-of-concept code

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Experts Warn Export Controls Cannot Stop AI Advancements in Cybersecurity

Cybersecurity experts argue that this institutional clash is delaying or masking a hard truth: AI capabilities from multiple companies and open-source developers will almost certainly have similar capabilities to Mythos 5 in the near future, if they don't already

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. "It's myopic in the extreme to think that no other competitors to Anthropic will develop similar capabilities to Mythos or even that they have not already done so," says Tarah Wheeler, chief security officer of TPO Group

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Logan Graham, Anthropic's frontier red team lead, told WIRED when Mythos Preview launched in April: "We need to prepare now for a world where these capabilities are broadly available in 6, 12, 24 months"

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. OpenAI also did a private release of a cybersecurity-focused model in mid-April and announced an expanded cybersecurity strategy

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Bruce Schneier, a researcher at Harvard University and the University of Toronto, notes: "Smaller, cheaper, open-source models, sometimes by themselves and sometimes in concert with each other, can match Mythos/Fable's performance with more sophisticated prompting"

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. A large group of cybersecurity leaders emphasized this in an open letter on Sunday, arguing that the White House's export-control directive was misguided

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Historical Precedents Suggest Export Controls May Backfire

The episode echoes historical attempts to control dual-use technology through export controls, with mixed results. In the 1990s, the U.S. government treated encryption products like Pretty Good Privacy (PGP) as dangerous weapons, opening a criminal investigation against creator Phil Zimmermann for allegedly violating arms export controls

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. Zimmermann fought back by publishing PGP's source code as a printed book, eventually winning when the investigation was closed and paving the way for end-to-end encryption algorithms used by billions today

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The Wassenaar Arrangement, an international treaty limiting export of dual-use software, has shown inherent weaknesses

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. Several countries don't adhere to the agreement, including Israel, which houses some of the world's most active spyware makers. Europe has continually failed to curb spyware exports to authoritarian regimes despite numerous scandals

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Peter Swire, a professor at Georgia Tech's School of Cybersecurity and Privacy and former adviser to the Clinton and Obama administrations, sees parallels. "The administration used the legal tool of export controls, but their real goal was to block use by everyone, Americans included," Swire says

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Policy Implications for AI Regulation and Cybersecurity Defense

The restriction may harm U.S. allies and, paradoxically, American security. "The U.S. hurts its own national security if the critical infrastructure of U.S. allies is undermined due to blockage of the best tools for defenders," Swire argues

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. Modern corporate networks, financial systems, and software supply chains are interdependent, and attackers can enter U.S. systems through weaker foreign nationals or partners abroad

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Chris Wysopal, cofounder of cloud security firm Veracode, frames the central question: "The policy question is not whether a technology has risk. The question is whether a specific restriction meaningfully reduces that risk or whether it mainly slows down the people trying to make systems safer"

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What governments need to focus on, experts say, is democratically developing much broader and more transparent plans for how they will contend with advances in AI capabilities on cybersecurity and other sensitive areas as they inevitably occur

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. Alan Woodward, a professor of cybersecurity at the University of Surrey, calls the restriction "a very blunt instrument"

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Source: Axios

Source: Axios

Anthropic's Business Momentum Despite Regulatory Scrutiny

Ironically, the controversy may actually benefit Anthropic. The AI lab finished May by surpassing OpenAI in market share of business spending for the first time, according to Ramp data

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. It raised $65 billion at a $965 billion valuation at the end of May, then filed confidential paperwork for an IPO in June, reportedly on the strength of its first-ever profitable quarter

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Anthropic's share of AI subscriptions paid for by businesses rose 2.5 percentage points in May to 41%, compared to OpenAI's 39.5%

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. "Anthropic's best month on record, as far as business adoption, was the month that the Department of Defense labeled them a supply chain risk," says Ara Kharazian, Ramp's lead economist

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. This drama comes after Anthropic refused to allow the government to use its models for mass surveillance of Americans and fully autonomous weapons, leading the Trump administration to declare the company a supply chain risk in March

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