UK banks still locked out of Anthropic's Mythos, Bailey says

Bank of England Governor Andrew Bailey confirmed at a central banking conference in Iceland that UK financial institutions remain blocked from accessing Mythos, Anthropic's powerful AI model. The restriction makes life significantly harder for banks that want to use cutting-edge technology to protect their digital infrastructure.

Access to a frontier model denied

Mythos is considered one of the most powerful AI systems Anthropic has ever built. Yet UK banks remain cut off from it. The reasons for the restriction have not been fully disclosed, but according to Bailey, the decision reflects regulators' cautious approach to deploying new AI tools in critical sectors of the economy. The Bank of England requires additional analysis and risk assessment before it allows new AI models to work with financial infrastructure.

The restriction looks paradoxical given that cyberattacks on banks are growing more sophisticated and dangerous. Financial institutions need the best tools to defend their systems, but they cannot use the most advanced solutions available on the global market.

The alternatives banks are using

Bailey said UK banks are not sitting idle. They are actively testing a range of alternative AI models and tools to probe and strengthen their cyber defenses:

• Commercial models from OpenAI and other vendors
• Open-source solutions available to developers
• In-house tools built for security analysis
• Specialized platforms from cybersecurity companies
• Traditional penetration testing and manual audits

However, all of these alternatives fall short of Mythos in power and capability. Many banks have to run several tools at once to reach the level of protection they need. That costs significant time and money, slows modernization, and diverts resources.

The widening gap between innovation and regulation

The Mythos situation reflects a broader trend: regulators move more slowly than the technology evolves. The Bank of England, like other central banks, is wary of uncontrolled AI deployment in critical systems.

On one hand, that makes sense: financial security demands reliability and predictability. On the other, excessive caution could slow innovation and weaken the competitiveness of the UK financial sector.

The question of access to Mythos will become a key issue in talks between the Bank of England, Anthropic, and financial institutions. If the restriction stays in place, it could accelerate the migration of operations to other jurisdictions.

What it means

The Mythos situation highlights a growing gap between technical capability and regulatory caution. For the UK financial sector, it means a real risk of falling behind in the race for the best digital tools. It is also a reminder that the financial system needs to strike the right balance between innovation and stability.