U.S. Treasury Secretary and Fed Chair urgently summoned major bank CEOs over concerns that Anthropic's latest AI model introduces a "whole new level of cyber risk" by detecting extreme vulnerabilities in systems like web browsers. This AI capability, and the potential for it to be replicated by adversarial states, presents a systemic risk to the core financial infrastructure. Banks are being directed to test and evaluate these risks internally. WATCH due to the high-level regulatory concern and the potential for this to catalyze new cybersecurity rules, increased compliance costs, and operational scrutiny for the financial sector. The risk is mitigated if banks and regulators successfully develop and implement defensive frameworks before the technology is widely weaponized.