Jamie Dimon has never been one to sugarcoat risk assessments. So when the CEO of the largest bank in the US tells investors that artificial intelligence is making his biggest fear even scarier, it’s worth paying attention, especially if you hold assets that live on the internet.
During JPMorgan’s Q1 2026 earnings call on April 14, Dimon was blunt about where the bank’s existential anxiety sits. “Cyber is our biggest risk… AI’s made it worse, it’s made it harder,” he said. The context: JPMorgan has been actively testing the Mythos AI model developed by Anthropic, and the results are apparently unsettling enough to keep a man who runs a $4 trillion balance sheet up at night.
What Mythos found, and why there’s a clock ticking
At a joint event with Anthropic CEO Dario Amodei on May 5-6, the two leaders laid out what Mythos has been doing behind the scenes. The model reportedly uncovered thousands of software vulnerabilities, many of which remain unpatched across systems.
Amodei put a timeline on the problem. He suggested there’s a window of roughly 6-12 months to address these vulnerabilities before they could be exploited more broadly.