Dimon calls Anthropic’s Mythos AI risks a ‘real issue’

TL;DR:

• Jamie Dimon told a Pennsylvania defence and innovation summit that risks from Anthropic’s Mythos model are a “real issue” the US government is on top of.
• JPMorgan was among a select group given access when Mythos launched in April; Dimon argued access to advanced AI must be controlled, saying “you’re giving ballistic missiles to individuals with Mythos”.
• The remarks land two days after a UK government adviser called British banks’ lack of Mythos access a wake-up call for the City.

JPMorgan Chase chief executive Jamie Dimon has publicly weighed in on the risks of Anthropic’s Mythos, telling Senator Dave McCormick’s Pennsylvania Defense and Innovation Summit that the model’s dangers are a “real issue” — and that access to it needs to be controlled.

Mythos has drawn interest from banks because it ranks among the most capable systems for finding cybersecurity vulnerabilities, letting firms uncover and fix weaknesses faster. That same capability is what worries governments. In June, Washington ordered Anthropic to restrict access to Fable 5 and Mythos 5 for foreign nationals on national security grounds, forcing a worldwide cut-off before the restrictions were lifted once new safeguards were in place.

The view from the UK

Dimon’s comments carry a particular sting for British banks. JPMorgan sits inside the select group that has had Mythos access since April — while UK lenders remain locked out of the model, a gap one government adviser this week called a wake-up call. The world’s largest bank getting early access to a cyber-defence tool its UK rivals cannot use is exactly the competitive asymmetry those advisers warned about.

There is a tension in Dimon’s position: his bank benefits from privileged access to the very capability he compares to munitions. But his framing also explains why broader access has been slow — the US government treats frontier vulnerability-hunting models as security-sensitive, and every extension of access is weighed against misuse by hostile states.

Looking forward

For UK financial institutions, the message is that Mythos access will be a matter of intergovernmental negotiation and demonstrated safeguards, not a commercial rollout timetable. Anthropic did not comment on Dimon’s remarks. How far Washington will let allied-country institutions inside the perimeter is now a live question for the City and its regulators.