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Japan's three megabanks gain access to GPT-5.5-Cyber and Claude Mythos for AI-powered cyber defense

Japan's three megabanks gain access to GPT-5.5-Cyber and Claude Mythos for AI-powered cyber defense

MUFG, SMBC, and Mizuho will use OpenAI's GPT-5.5-Cyber and Anthropic's Claude Mythos to detect vulnerabilities and block AI-generated attacks, under a 36-member FSA working group that seats both AI labs alongside the banks. The arrangement shows Japan's financial regulator treating AI cyber-risk as a systemic infrastructure problem — coordinated nationally, with frontier labs inside the process rather than outside it.

Source: asia.nikkei.com ↗

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Japan's three biggest banks are expected to gain access to U.S.-based OpenAI's latest artificial intelligence model, in a move to strengthen defenses against cyberattacks.

Nikkei

Why this matters

  • → Japan's three megabanks gain direct access to frontier AI models specifically designed for cyber defense, raising the baseline for financial-sector security.
  • → The FSA working group embeds OpenAI and Anthropic inside the regulatory process, treating AI-driven cyber risk as a systemic infrastructure problem rather than a vendor relationship.
  • → Coordinated national deployment signals how regulators may orchestrate AI adoption across critical sectors going forward.
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