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Japan’s bank regulator sets up forum to counter Mythos-powered cyber threats

By Thomson Reuters May 12, 2026 | 4:29 AM

By Kentaro Okasaka

TOKYO, May 12 (Reuters) – Japan will establish a public-private working group this week to address cybersecurity risks to the ​financial system posed by Anthropic’s new ‌artificial intelligence model Mythos, Finance Minister Satsuki Katayama said on Tuesday.

• Katayama, who met U.S. Treasury Secretary Scott Bessent in Tokyo on Tuesday, said the group aims to ‌develop ​shared understanding of potential ⁠threats arising from AI ⁠among financial and tech industries and policymakers, with inputs from the U.S. government.

• A total of 36 entities, including financial institutions from megabanks ​to internet banks, the Bank of Japan and the Japanese units of Anthropic and ⁠OpenAI, will hold the group’s ⁠first meeting on Thursday, chaired by ​Mizuho Financial Group’s Chief Information Security Officer Osamu ​Terai, according to the Financial Services Agency (FSA).

• Anthropic ‌has launched Project Glasswing to offer access to its latest AI model for defensive purposes to a limited number of organisations. The FSA ⁠said interest among Japanese banks in gaining access to the model is growing, though it did not clarify ⁠whether any ‌have formally sought access.

• The ⁠working group will discuss procedures when ​vulnerabilities are ‌found, defensive measures and contingency ​planning for ⁠scenarios where threats cannot be fully contained, the FSA said. The regulator also said it is considering information-sharing with U.S. and other overseas authorities.

(Reporting by Kentaro Okasaka. Writing by Kantaro Komiya. Editing by ​Mark Potter)