Prime Minister Takashi Takaichi ordered government ministers to quickly implement specific measures against threats posed by the new AI "Claude Mythos" [1].

The directive comes as concerns grow over the AI's ability to automate the discovery of system vulnerabilities and generate attack programs [1, 3]. This capability poses a significant risk to financial institutions and critical national infrastructure, which could be targeted by sophisticated cyberattacks [1, 3].

Cyber Security Minister Naoto Matsumoto said the government is coordinating a response to address both the protection of critical infrastructure operators and the discovery and correction of security vulnerabilities [1]. He said the Prime Minister issued the instruction to ensure the entire government responds urgently to these threats [1].

Parallel to the executive action, the Liberal Democratic Party has drafted a proposal calling for the establishment of an emergency response system to handle these specific AI-driven threats [1, 2]. The party's initiative seeks to create a structured framework for rapid mobilization when AI-generated vulnerabilities are exploited [2].

Financial officials have also been engaged in the effort. Finance Minister Katayama discussed the risks associated with the "Mythos" AI on the afternoon of the 24th [4], focusing on the need for cybersecurity enhancements within the financial sector to prevent systemic instability [4].

The AI in question was developed by the U.S.-based company Anthropic [1, 3]. While AI tools can be used for defensive security, the automation of exploit generation represents a shift in the cyber threat landscape that requires a coordinated state-level response [3].

“The government is coordinating a response to address both the protection of critical infrastructure operators and the discovery and correction of security vulnerabilities.”

The Japanese government's urgent reaction highlights a critical transition in cybersecurity where AI is no longer just a tool for analysis, but an active agent capable of offensive weaponization. By involving both the Prime Minister's office and the ruling party's legislative framework, Japan is attempting to move from a reactive patching cycle to a proactive, state-level defense posture against autonomous threats.