Japan to introduce Anthropic Claude Mythos to strengthen banking network cybersecurity defenses

BlockBeats News, on June 4, Japan will introduce Anthropic Claude Mythos for banking network defense. Major banks such as Mitsubishi UFJ, Mizuho, and Sumitomo Mitsui will gain access.

Japanese Finance Minister Katsuki Katayama stated that the government has established a public-private joint task force to assess the potential risks this model could pose to the financial system. According to Anthropic, the unreleased Claude Mythos Preview is designed specifically for defensive cybersecurity operations. It can be used for local vulnerability detection and penetration testing, and has already discovered thousands of high-risk vulnerabilities—including multiple zero-day vulnerabilities—across major operating systems and browsers.

Katayama also revealed that some Japanese financial institutions have already received cybersecurity capability support from OpenAI GPT-5.5 through restricted access arrangements.

This move indicates that companies such as OpenAI and Anthropic are promoting the use of advanced code models in the financial industry’s network security sector, positioning them as vital tools for enhancing the defense capabilities of critical infrastructure.