Mythos and friends could be a ‘net positive’ for UK cyber security defenses but only if they’re secured, says top cyber official
Publish Date: 2026-04-22 06:13:00
Source Domain: www.techradar.com
- NCSC’s Richard Horne says hacking AI tools like Mythos Preview can strengthen defenses if guardrails are in place
- Anthropic’s Mythos Preview, part of Project Glasswing, finds zero‑days at scale
- Horne argues frontier AI exposes weak fundamentals quickly, giving defenders a chance to decisively outpace cybercriminals
With proper guardrails and safety regulations, hacking AI tools such as Mythos Preview can be net positive for cybersecurity defenses everywhere, says Richard Horne, head of the National Cyber Security Centre (NCSC).
According to the BBC, Horne echoed these statements in a speech to the NCSC’s annual conference CyberUK, on Wednesday.
“As we have seen in the media in recent days, frontier AI is rapidly enabling discovery and exploitation of existing vulnerabilities at scale, illustrating how quickly it will expose where fundamentals of cyber-security are still to be addressed,” he said.
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This time is different
Earlier this month, Anthropic announced a new security initiative called Project Glasswing, and at its heart, the newest AI model, Mythos Preview. This model was apparently so good at discovering and exploiting zero-day vulnerabilities, that Anthropic decided to only give it to a handful of large software companies. That way, these companies can get a head start against bad actors, before the model is released to the general public at a (yet undetermined) later date.
There is also plenty of chatter online about this being just a PR stunt, with some people stating that OpenAI did the same for GPT-2 which later turned out to be a lot more benign.
However, this time it really might be different. The Mozilla Foundation said that with the help of Mythos it managed to find 271 vulnerabilities in Firefox 150, the famed browser’s latest build. When it tried a similar thing with an earlier model – Opus 4.6 against Firefox 148 – it found “just” 22 bugs.
Announcing the…
