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Japan Megabanks to Gain Access to Anthropic's Mythos in About Two Weeks, Source Says

The restricted preview will let the lenders use the model to find vulnerabilities and draft fixes as regulators prepare a 36-entity risk group.

  • Japan's three megabanks—Mitsubishi UFJ Financial Group, Mizuho Financial Group, and Sumitomo Mitsui Financial Group—are set to gain access to Anthropic's vulnerability-hunting AI model, Claude Mythos, within roughly two weeks.
  • Treasury Secretary Scott Bessent conveyed the access decision during meetings in Tokyo this week, aligning the rollout with Treasury statecraft rather than Anthropic's standard commercial channels.
  • Japanese Finance Minister Satsuki Katayama announced a 36-entity public-private working group chaired by Mizuho to identify exposures and implement defensive measures across the Japanese financial system.
  • Mozilla last week shipped Firefox with fixes for 271 vulnerabilities found by Mythos in a single evaluation pass, offering a template for how the banks will use the model.
  • The banks will join Anthropic's restricted Project Glasswing, which grants access on a case-by-case basis to help institutions manage cybersecurity challenges posed by frontier AI to legacy technology systems.
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ReutersReuters
+3 Reposted by 3 other sources
Center

Japan megabanks to gain access to Anthropic's Mythos in about two weeks, source says

·United Kingdom
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Center

The three largest banks in Japan will gain access to the new model of artificial intelligence (IA) Claude Mythos of the American firm Anthropic, to strengthen their defense systems against possible cyber attacks on the financial sector, reported this Wednesday Japanese media.Continue reading....

·Barcelona, Spain
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Lean Right

With its often outdated IT infrastructure, the banking industry is considered to be particularly vulnerable to attacks. Japan's three largest banks will soon have access to AI "myths" to detect security vulnerabilities.

·Düsseldorf, Germany
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Center

Tokyo, May 13 (EFE).- The three largest banks in Japan will gain access to the new artificial intelligence model (IA) Claude Mythos of the U.S. firm Anthropic, to strengthen their defense systems against possible cyber attacks on the financial sector, reported Japanese media on Wednesday. Kyodo news agency stated that the integration was agreed during this week's meeting in Tokyo of executives of the banking entities MUFG Bank, Sumitomo Mitsui B…

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Kyodo News+ broke the news in Japan on Wednesday, May 13, 2026.
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