Artificial intelligenceMUFG Bank, SMBC and Mizuho Bank would gain access to powerful tool alongside Claude MythosSumitomo Mitsui Banking Corp., Mizuho Bank and MUFG Bank will now have two powerful tools to thwart cyberattacks. (Source photos by Nikkei)Nikkei staff writersMay 29, 2026 00:14 JSTTOKYO -- Japan's three biggest banks are expected to gain access to U.S.-based OpenAI's latest artificial intelligence model, Nikkei learned Thursday, in a move to strengthen defenses against cyberattacks.
Top Japanese banks to use OpenAI's new model against cyberattacks
MUFG Bank, SMBC and Mizuho Bank would gain access to powerful tool alongside Claude Mythos
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