U.S. Regulators Warn Major Banks About Anthropic’s Mythos Cyber AI
U.S. Treasury Secretary Scott Bessent and Federal Reserve Chair Jerome Powell reportedly convened an urgent meeting with chief executives from major Wall Street banks to warn that Anthropic’s new AI model, Mythos, could accelerate the discovery and exploitation of previously unknown software flaws. The discussions included leaders from systemically important institutions such as Citigroup, Morgan Stanley, Bank of America, Wells Fargo, and Goldman Sachs, reflecting concern that advanced offensive cyber capabilities could create not only enterprise security problems but broader financial-stability risks.
Anthropic has described Mythos as a model built for cybersecurity software engineering that can identify vulnerabilities across major operating systems, web browsers, and other software, and in some cases help assemble sophisticated exploits. The company did not broadly release the model, instead limiting access under Project Glasswing to roughly 40 technology firms including Microsoft and Google, while briefing U.S. officials and industry stakeholders on its risks and defensive uses. Officials are also weighing the implications for crypto and DeFi platforms, where low-cost, real-time zero-day discovery could increase the threat of disruptive attacks.
Timeline
May 6, 2026
SEBI issues Mythos cyber alert for India's securities sector
India’s Securities and Exchange Board of India issued an advisory urging equities-market participants to urgently review cybersecurity posture due to risks that Anthropic’s Mythos could accelerate cyberattacks. SEBI also established a taskforce to assess AI-related cyber risks, share threat intelligence, review third-party software vendors, and guide defensive measures across the securities industry.
Apr 28, 2026
Australian banks move to address Mythos-linked cyber risks
Australian banks were reported to be on edge over Anthropic's Mythos model and rushing to identify and fix cybersecurity weaknesses it could expose. The development marked the spread of banking-sector concern over Mythos to Australia, beyond earlier responses in the U.S., U.K., and Germany.
Apr 28, 2026
OMB begins planning controlled Mythos rollout to federal agencies
Federal CIO Greg Barbaccia said the Office of Management and Budget has started preparing for a controlled rollout of Anthropic's Mythos model to U.S. agencies in coordination with the Office of the National Cyber Director. He said no federal agencies had deployed Mythos yet and that the government remained in an early evaluation phase, with some agencies seeking access while CISA had not received it.
Apr 23, 2026
Anthropic investigates claims of unauthorized access to Mythos
Anthropic was reported to be investigating claims that unauthorized users may have gained access to its restricted Mythos model. The company had not identified any malicious use at the time, but the inquiry suggested possible leakage beyond the tightly controlled access program.
Apr 21, 2026
Bundesbank chief urges wider institutional access to Mythos
Bundesbank President Joachim Nagel warned that Anthropic's Mythos could pose major cybersecurity risks to banks because of its ability to rapidly identify and exploit software vulnerabilities. He argued that access should be broadened to all relevant institutions to avoid competitive imbalances and reduce the risk of misuse by a limited group of actors.
Apr 20, 2026
Asian regulators raise scrutiny on banks over Mythos cyber risks
Regulators in Asia reportedly increased scrutiny of banks amid fears that Anthropic's Mythos model could expose or accelerate exploitation of cybersecurity weaknesses in financial systems. The move marked a further regional expansion of official oversight beyond earlier actions in the U.S., U.K., and Germany.
Apr 17, 2026
IMF and central bank leaders warn AI models could expose banking weaknesses
During the IMF and World Bank spring meetings in Washington, senior international financial officials including IMF Managing Director Kristalina Georgieva, ECB President Christine Lagarde, Bank of England Governor Andrew Bailey, and Canada's finance minister warned that emerging AI models could expose structural weaknesses in global banking and payment systems. The discussion highlighted fears that models such as Anthropic's Mythos could accelerate vulnerability discovery and exploitation faster than regulatory safeguards can adapt.
Apr 17, 2026
Anthropic CEO scheduled for White House meeting on Mythos risks
Anthropic CEO Dario Amodei was reportedly scheduled to meet White House Chief of Staff Susie Wiles as U.S. officials assessed the national security implications of the Mythos model. The engagement reflected federal concern that Mythos's vulnerability-discovery capabilities could aid both defensive remediation and offensive cyber operations.
Apr 16, 2026
German banks and regulators begin assessing Mythos cyber risks
German banks and financial authorities began examining the cybersecurity risks posed by Anthropic's Mythos model to the banking sector and legacy systems. The German Banking Association said it was consulting member-bank cyber experts along with Germany's finance ministry, the Bundesbank, and BaFin on preparedness for newly discovered vulnerabilities.
Apr 15, 2026
UK government issues open letter urging businesses to bolster cyber defenses
The British government issued an open letter urging businesses to strengthen baseline cybersecurity, improve executive accountability, and prepare for AI-accelerated vulnerability discovery and exploitation following concern around Anthropic's Mythos model. The warning cited a U.K. AI Security Institute evaluation that found Mythos more capable at cyber offense than any model the institute had previously assessed, while noting significant testing limitations.
Apr 14, 2026
Goldman Sachs begins testing Mythos to strengthen cyber defenses
Goldman Sachs said it is testing Anthropic's restricted Mythos model with Anthropic and security vendors to better understand emerging AI-enabled cyber risks and improve defenses. The bank also said it is accelerating investment in cyber and infrastructure resilience as concern grows over Mythos's offensive capabilities.
Apr 14, 2026
UK regulators begin urgent assessment of Mythos cyber risks
British financial regulators, Treasury officials, and the National Cyber Security Centre reportedly began urgent discussions with major banks to assess cyber risks linked to Anthropic's Claude Mythos Preview. The review focused on vulnerabilities the model could expose in critical IT systems, extending official concern beyond the earlier U.S. response.
Apr 10, 2026
Bessent and Powell convene urgent meeting with major bank CEOs
U.S. Treasury Secretary Scott Bessent and Federal Reserve Chair Jerome Powell reportedly held an urgent Washington meeting with CEOs from major Wall Street banks to warn them about cyber risks tied to Mythos and similar AI systems. The discussion focused on ensuring systemically important banks understood the threat and were taking defensive measures against potential AI-enabled cyber incidents.
Apr 7, 2026
Anthropic briefs U.S. officials and industry on Mythos cyber capabilities
Around the time of launch, Anthropic briefed U.S. government officials and industry stakeholders on Mythos's offensive and defensive cybersecurity capabilities. The company also said it consulted U.S. officials before release because the model could identify critical bugs and help assemble sophisticated exploits.
Apr 7, 2026
Anthropic launches Mythos with tightly restricted access
Earlier in the week before April 10, 2026, Anthropic launched its new AI model Mythos but did not broadly release it because of concerns it could uncover previously unknown cybersecurity vulnerabilities. Access was reportedly limited under Project Glasswing to about 40 technology companies, including Microsoft and Google.
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