* Mythos AI raises cybersecurity concerns among

regulators and policymakers

* Rollout to European banks may take days or weeks,

sources familiar with the matter say

* German central bank chief Joachim Nagel urges equal

access to prevent misuse

By Saeed Azhar, Jeffrey Dastin and Mathieu Rosemain

NEW YORK/PARIS, April 21 (Reuters) - Anthropic plans to

provide access to its Mythos AI model to European banks soon,

three people familiar with the matter said, as global banks

scramble to test the technology after large U.S. banks were

given initial access.

Mythos is viewed by cybersecurity experts as posing significant

challenges to the banking industry and its legacy technology

systems, prompting a series of warnings from regulators and

policymakers gathered at last week's International Monetary Fund

spring meeting in Washington. A string of U.S. banks have so far

been given access to Mythos - while the rest of the industry

tries to catch up.

Anthropic aims to expand Mythos AI access to European and UK

banks, among other organizations, one of the people familiar

with the matter told Reuters.

That process involves checks to ensure the rollout is done

securely, the person said, speaking on condition of anonymity.

Another person said the access could be provided to European

banks within days, while the first person said the rollout might

take days or weeks. Bloomberg previously reported that Anthropic

would release Mythos to UK financial institutions soon.

Anthropic did not immediately respond to a Reuters request

for comment.

Anthropic initially provided access to the model to partners

in its Project Glasswing initiative and about 40 additional

organisations that build or maintain critical software

infrastructure.

JPMorgan Chase ( JPM ), which is part of Glasswing, was the

only bank Anthropic has publicly said has access, although Bank

of America ( BAC ) has been part of Glasswing since the start

and has been testing the Mythos technology internally, according

to a source familiar with the matter.

Other U.S. banks have more recently said they have been given

access to Mythos, as regulators rush to examine the

cybersecurity risks the new artificial intelligence model

raises.

German central bank chief Joachim Nagel called on Tuesday for

all institutions to have access to Anthropic's artificial

intelligence model Mythos to keep the playing field even and to

avoid it being misused.