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, sent to chief technology officers, chief information security officers, and chief risk officers across the financial industry, stated that “advanced artificial intelligence models, such as Anthropic Claude Mythos, significantly compress the timeframe for effective risk mitigation.” Cybersecurity experts say Mythos, described as extremely capable at finding and exploiting cybersecurity vulnerabilities, poses significant challenges to the banking industry. 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 AI model. OSFI sent the email on April 29. After Reuters sent questions, OSFI posted a public bulletin on generative and agentic artificial intelligence on Monday, stating it takes a “technology‑neutral, risk‑focused approach” to emerging technologies.