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


FILE PHOTO: Anthropic logo is seen in this illustration taken March 1, 2026. REUTERS/Dado Ruvic/Illustration/File Photo

TOKYO, ⁠May 13 (Reuters) - Japan's three largest banks are ⁠expected to gain access to Mythos, ‌the artificial intelligence model developed by Anthropic, in about two weeks, a person with direct knowledge of the matter ​said.

Mythos is viewed by cybersecurity ⁠experts as posing ⁠significant challenges to the banking industry and its ⁠legacy ‌technology systems, prompting a series of warnings from regulators and policymakers.

A string ⁠of U.S. banks have so far been ​given access ‌to Mythos and Anthropic aims to expand ⁠access to ​European and UK banks, among other organisations, Reuters reported last month. Mitsubishi UFJ Financial Group, Mizuho Financial ⁠Group and Sumitomo Mitsui Financial ​Group declined to comment. Anthropic did not respond to a request for comment. On Tuesday, Japanese Finance ⁠Minister Satsuki Katayama met U.S. Treasury Secretary Scott Bessent and later said Japan would establish a public-private working group this week to ​address cybersecurity risks to the ⁠Japanese financial system posed by Mythos. The group's first ​meeting will be held ‌on Thursday.

(Reporting by Takaya Yamaguchi; ​Additional reporting by Miho Uranaka; Writing by Sam Nussey; Editing by Muralikumar Anantharaman)

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