Canada's federal banking regulator, the Office of the Superintendent of Financial Institutions (OSFI), warned the country's largest financial institutions about the risks of Anthropic's Claude Mythos and other advanced AI models in an email sent in April, according to documents Reuters obtained through an access-to-information request. The email was sent to chief technology officers, chief information security officers, and chief risk officers across the financial industry, including big banks and insurers. OSFI said in the email that "advanced artificial intelligence models, such as Anthropic Claude Mythos, significantly compress the timeframe for effective risk mitigation." Cybersecurity experts describe Mythos as an AI model extremely capable at finding and exploiting cybersecurity vulnerabilities. After Reuters sent questions to OSFI last week, the regulator on Monday posted a public bulletin on generative and agentic artificial intelligence online, stating it takes a "technology‑neutral, risk‑focused approach" and its focus is how institutions govern and manage risks. In early April, Canadian bank executives met with regulators to discuss the risks posed by Mythos shortly after U.S. Treasury Secretary Scott Bessent and then-Federal Reserve Chair Jerome Powell convened an urgent meeting with bank CEOs to warn of cyber risks posed by Anthropic's latest artificial intelligence model.