Tech can scale cyber-attacks and defences alike, raising questions about private power, public risk and the future of a shared internetAnthropic announced its latest AI model, <a href=”https://www.theguardian.com/technology/2026/apr/08/anthropic-ai-cybersecurity-software”>Claude Mythos, this month but said it would not be released publicly, because it turns computers into crime scenes. The company claimed that it could find previously unknown “zero-day” flaws, exploit them and, in principle, link these weaknesses in order to take over <a href=”https://red.anthropic.com/2026/mythos-preview/”>major operating systems and web browsers. Mythos did so autonomously, writing code and obtaining privileges. The implications are significant. It’s like a;burglar being able to target any building, get inside, unlock every door and empty every safe.The Silicon Valley company has so far named 40;<a href=”https://www.bbc.co.uk/news/articles/crk1py1jgzko”>organisations as partners under Project Glasswing to help mount a defence asking them to “patch” vulnerabilities before hackers get a chance to exploit them. All are American, sitting at the heart of the US-led digital system. Anthropic shared Mythos with only Britain outside the US, allowing the AI Security Institute to test frontier models. After seeing it up close, British ministers <a href=”https://www.gov.uk/government/publications/ai-cyber-threats-open-letter-to-business-leaders/ai-cyber-threats-open-letter-to-business-leaders-html”>warned: AI is about to make cyber-attacks much easier and faster, and most businesses are not ready. Banks in <a href=”https://www.reuters.com/business/finance/anthropic-plans-provide-mythos-access-european-banks-soon-sources-say-2026-04-21/”>Europe are likely to test it next.<em><strong>Do you have an opinion on the issues raised in this article? If you would like to submit a response of up to 300 words by email to be considered for publication in our<a href=”https://www.theguardian.com/tone/letters”> letters section, please <a href=”mailto:guardian.letters@theguardian.com?body=Please%20include%20your%20name,%20full%20postal%20address%20and%20phone%20number%20with%20your%20letter%20below.%20Letters%20are%20usually%20published%20with%20the%20author%27s%20name%20and%20city/town/village.%20The%20rest%20of%20the%20information%20is%20for%20verification%20only%20and%20to%20contact%20you%20where%20necessary.”>click here.</strong></em> <a href=”https://www.theguardian.com/commentisfree/2026/apr/23/the-guardian-view-on-anthropics-claude-mythos-when-ai-finds-every-flaw-who-controls-the-internet”>Continue reading…
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