JAPAN’S BANKING GIANTS FALL IN BEHIND ANTHROPIC — MEGABANKS JOIN AI COALITION AS CLAUDE MYTHOS FEARS SPOOK REGULATORS Eight of Japan’s most powerful financial institutions have signed on to a new AI collaboration between NEC and Anthropic, joining a program aimed at deploying Claude technology across banking, insurance, and securities operations. Sumitomo Mitsui Financial Group, MS&AD Insurance, Sumitomo Life, Daiwa Securities, Sumitomo Mitsui Trust Group, and Meiji Yasuda Life Insurance are all part of the initiative. The move comes as Japan simultaneously grapples with deep anxiety over Anthropic’s most powerful model. Claude Mythos has triggered alarm among Japanese financial regulators who fear the AI could be weaponized to carry out sophisticated cyberattacks against the very institutions now signing up to use it. The country’s financial ministry has already convened a 36-institution public-private working group specifically focused on Mythos-related cybersecurity threats. NEC and Anthropic announced their foundational partnership in April, targeting finance, manufacturing, and local government. The financial sector rollout is the first formal deployment at scale, using Claude to build new customer-facing services and to streamline internal business processes. What Japan is doing reflects a broader reality emerging across global finance: the same AI powerful enough to help you serve customers is powerful enough to help someone rob you blind. Keywords: Japan Anthropic Claude, NEC Anthropic Japan banks, Claude Mythos cybersecurity, Japan AI finance