UK banks blocked from Mythos AI model as US political hold-up delays cyber threat testing

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British banks remain unable to access Anthropic's Mythos AI model six weeks after being promised early access to test their systems against cyber threats. Bank of England Governor Andrew Bailey confirms a political hold-up with the U.S. administration is blocking the trial, despite Anthropic's willingness to share. Bailey calls for international cooperation on AI-related cyber risks.

UK Banks Denied Access to Mythos AI Model Despite Early Promise

British financial institutions remain locked out of Anthropic's Mythos AI model six weeks after being promised early access to test their defenses against cyber threats, Bank of England Governor Andrew Bailey confirmed on Friday

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. Speaking to Bloomberg TV on the sidelines of a central banking conference in Reykjavik, Bailey revealed that while Anthropic has expressed willingness to share the models on a trial basis, a political hold-up with the U.S. administration continues to block UK banks from gaining the access they need

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Source: Reuters

Source: Reuters

"It hasn't happened yet and I think this has been somewhat caught up in the process with the U.S. administration," Bailey explained during his interview

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. The delay affects what's known as Glasswing phase two, which has been in development for approximately six weeks but has yet to be implemented

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. Bailey acknowledged the frustration, noting that he couldn't explain why the process differs from one company to another, but emphasized that given concerns about AI-related cyber risks, securing access to Mythos AI model is critical .

Political Tensions Between Anthropic and US Administration

The access delay comes amid broader tensions between Anthropic and U.S. authorities over guardrails for military use of AI tools

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. Anthropic announced in April that it would provide UK banks early access to help strengthen their cybersecurity systems ahead of wider release

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. The Mythos AI model can automatically discover new software bugs previously unknown, potentially leaving companies vulnerable to serious attacks

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Source: ET

Source: ET

Last month, Bailey stated that "Anthropic may have found a way to crack the whole cyber risk world open," highlighting the significance of the technology

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. However, some cybersecurity experts have since told Reuters that fears of unfettered hacking with the model are overstated . President Donald Trump last week postponed signing a broader executive order on AI that was expected to create a voluntary framework for AI developers to engage with the U.S. government before public release of advanced AI models

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Bailey Calls for Global Approach to Managing Threats

Bailey, who also heads the international standard-setting Financial Stability Board, stressed the urgent need for a global approach to managing threats posed by AI-powered hacking tools . "Spillovers from this sort of cyber risk are so big that we can't just have a single sort of national approach," he warned

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. The interconnectedness of financial systems means that isolated national responses won't suffice, according to Bailey. "Anybody who thought, 'Well, I've dealt with my banks, that's okay', I'm afraid that won't work, because they're all so heavily interconnected," he added

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Bailey confirmed that banks are currently using other models to test their cyberdefenses while waiting for access to the Mythos AI model

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. The situation highlights growing challenges around international cooperation on emerging AI technologies, particularly when national security considerations intersect with financial stability concerns. As hacking risks continue to evolve with AI capabilities, the ability of financial institutions to test and strengthen their defenses becomes increasingly vital for maintaining trust in global banking systems.

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