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US security agency is using Anthropic’s Mythos despite blacklist, Axios reports

By Thomson Reuters Apr 19, 2026 | 1:12 PM

April 19 (Reuters) – The United States National Security Agency is using Anthropic’s Mythos Preview AI tool despite the ​Pentagon hitting the company with ‌a formal supply-chain risk designation, Axios reported on Sunday.

The Mythos Preview model was being used more widely within the department, Axios said, citing ‌sources. ​Reuters could not immediately ⁠verify the report.

Anthropic, the ⁠NSA and the Department of Defense did not immediately respond to requests for comment outside regular business hours. The ​NSA is part of the Defense Department.

Last week, U.S. President Donald Trump’s ⁠administration and Anthropic’s CEO ⁠discussed working together for the ​first time since a dispute earlier this ​year between the Pentagon and the ‌AI firm over how that company’s models should be used.

The talks came amid growing fears the artificial intelligence startup’s latest ⁠model Mythos will supercharge cyberattacks.

The model is the company’s “most capable yet for coding and agentic ⁠tasks,” Anthropic ‌has previously said, referring to ⁠the model’s ability to act ​autonomously.

Its ‌capabilities to code at a ​high level ⁠have given it a potentially unprecedented ability to identify cybersecurity vulnerabilities and devise ways to exploit them, experts have said.

(Reporting by Gursimran Kaur in Bengaluru; Editing by ​Bill Berkrot)