Japan’s three financial giants just got a serious upgrade in cyber defense. OpenAI handed over its latest AI model, GPT-5.5 Cyber, exclusively to MUFG, Sumitomo Mitsui, and Mizuho banks. This isn’t a casual software deal—it’s a government-backed cybersecurity pact with diplomatic muscle. The model targets vulnerabilities before attackers do. It’s part of a “Trusted Access












