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UK telcos face scrutiny over AI cyber risks from Claude Mythos Preview

By Patricia Figueiredo ( April 23, 2026, 15:53 GMT | Insight) -- UK telecom providers have been urged by Ofcom to follow guidance from the National Cyber Security Centre and the UK AI Safety Institute on risks linked to Anthropic’s Claude Mythos Preview. Speaking at a conference in Glasgow, a senior Ofcom official said the regulator has written to companies outlining expectations. The warning comes as tests show the model can autonomously exploit vulnerabilities and carry out multi-step cyberattacks.UK telecom providers have been urged to follow advice from the National Cyber Security Centre and the UK AI Safety Institute regarding the potential risks posed by Anthropic’s general purpose AI model Claude Mythos Preview, as the regulator Ofcom pointed to the need for flexible cyber rules that can keep pace with fast-moving technology....

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