America's biggest banks are dealing with a problem most of their customers don't know about yet. Since April 7, JPMorgan Chase, Goldman Sachs, Citigroup, Bank of America, and Morgan Stanley have had access to Anthropic's Claude Mythos Preview, an AI model so capable that Anthropic refused to release it to the public.
What those banks found using it has sparked a scramble across some of the most powerful financial institutions in the world, as Reuters reported on May 12. At a May 5 financial services event in New York, Anthropic CEO Dario Amodei, appearing alongside JPMorgan CEO Jamie Dimon, put a hard deadline on all of it. Chinese AI models are "maybe six to 12 months" behind Mythos, he said, and there is "that same window" to fix what the model is finding.
What Mythos Is Doing Inside Bank Systems Right Now
Mythos's real threat isn't the volume of vulnerabilities it finds, but how it chains them together. Sources at major banks told Reuters on May 12 that the model is expert at taking individually low-risk weaknesses and linking them into a single high-risk attack path, turning flaws that once looked manageable into serious potential entry points for breaches.
That's forced urgent software upgrades across Wall Street. "This is a wake-up call because cyber risk is moving to machine speed, while much of bank defense still operates at human speed," said Nitin Seth, CEO of Incedo, a data and AI services firm.
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