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CISA Lacks Access to Anthropic's Security AI Model as Other Agencies Use It for Testing

TechnologyPolitics4/21/2026
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The Cybersecurity and Infrastructure Security Agency (CISA) does not have access to Anthropic's Mythos Preview model, a specialized AI for finding security vulnerabilities, according to sources. Other government agencies, including the National Security Agency (NSA) and the Commerce Department, are reportedly using the model to test their own systems. This comes as CISA faces significant budget and workforce reductions under the current administration.

Facts First

  • CISA lacks access to Anthropic's Mythos Preview model, according to sources, while other agencies like the NSA and Commerce are using it.
  • Anthropic decided against a public release of Mythos due to its ability to quickly discover and exploit security vulnerabilities.
  • The model has been provided to over 40 companies and organizations for testing and system fortification.
  • CISA has lost more than a third of its workforce and millions in funding, with the acting director stating resources are "more limited than I would like."
  • The Department of Defense has declared Anthropic a "supply chain risk," and national cyber director Sean Cairncross is negotiating broader civilian agency access to Mythos.

What Happened

The Cybersecurity and Infrastructure Security Agency (CISA) does not have access to Anthropic's Mythos Preview model, according to sources. Some other government agencies, including the National Security Agency (NSA) and the Commerce Department's Center for AI Standards and Innovation, are reportedly using the model. Anthropic decided against a public release of Mythos due to its ability to quickly discover and exploit security vulnerabilities and has provided it to more than 40 companies and organizations for testing. An Anthropic official stated the company briefed CISA and the Commerce Department on the model's capabilities earlier this month.

Why this Matters to You

The security of government networks and critical infrastructure directly impacts national safety and the protection of citizens' data. A key agency tasked with defending these systems may lack a tool that other parts of the government are using to find and fix vulnerabilities before they can be exploited. This situation could affect the overall resilience of systems you rely on for services, financial security, and personal information protection. The ongoing negotiations for broader access suggest this gap may be addressed.

What's Next

National cyber director Sean Cairncross is among the officials negotiating broader civilian agency access to Mythos, with the Treasury Department also involved in talks. Organizations with access have predominantly been using the model to find vulnerabilities in their own networks. The future of CISA's capacity may be influenced by budget proposals, as the current administration has proposed cutting as much as $707 million from the agency's budget for the upcoming fiscal year.

Perspectives

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Security Analysts argue that CISA's inability to access the model is a critical failure given their mandate to protect infrastructure like "banks and power plants" against emerging AI-powered cyberattacks.
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Political Observers suggest that internal agency instability during the second Trump administration may have hindered CISA's ability to secure model access more rapidly.
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Defense Experts highlight a strategic contradiction regarding the NSA's utilization of Mythos, noting the Department of Defense has labeled Anthropic a "supply chain risk."