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Japan’s financial watchdog to meet top banks to discuss Mythos AI model

By Thomson Reuters Apr 21, 2026 | 9:20 PM

TOKYO, April 22 (Reuters) – Japan’s financial watchdog will meet with the country’s biggest lenders on Friday to ​discuss issues related to Anthropic’s ‌advanced Mythos artificial intelligence model, Finance Minister Satsuki Katayama said on Wednesday.

The meeting, set up by the Financial Services Agency, will bring ‌together ​top lenders Mitsubishi UFJ ⁠Financial Group Inc, ⁠Sumitomo Mitsui Financial Group Inc and Mizuho Financial Group Inc.

The Bank of Japan and the Tokyo Stock Exchange ​will also join the meeting, Katayama told reporters.

“We will bring together the ⁠core members who ⁠bear the greatest responsibility to ​share assessments of the current situation and ​exchange views, including issues that have ‌been flagged in various parts of the international financial community,” she said.

Designed for defensive cybersecurity tasks, Mythos’ vast capabilities ⁠have sparked fears about the threat to traditional software security, after Anthropic said a preview ⁠had ‌uncovered “thousands” of major vulnerabilities in “every ⁠major operating system and web ​browser.”

Some ‌Asian financial regulators said ​this week ⁠they were taking measures to address the risks posed by Mythos.

(Reporting by Disha Mishra in Bengaluru and Makiko Yamazaki in Tokyo; Editing by Tom Hogue and ​Louise Heavens)