- BT is the first UK company to join Anthropic’s Project Glasswing
- High risk Claude Mythos Preview model is limited to selected partners only
- Britain’s infrastructure ready for a major security boost – BT already blocks 4 million attacks daily
BT has become the first UK company to publicly confirm membership of Anthropic’s Project Glasswing, a cyber security initiative that gives partners access to the company’s most advanced cyber security model, the Claude Mythos Preview.
The announcement was made at the UK government’s AI Adoption Summit, where BT CEO Allison Kirkby stated that the partnership would help the company defend both its own networks and customer systems against evolving and sophisticated attacks.
“AI only works at scale when it is supported by future-ready networks that are secure, resilient, secure,” Kirkby said, pledging to “work with the government to support the further development and deployment of superb UK AI capabilities so that the UK can be an AI maker and not just a taker.”
BT joins Anthropic’s Project Glasswing
Anthropic launched Project Glasswing in April 2026 with select partners in response to AI-powered attacks.
At the time, Anthropic boasted that the Claude Mythos Preview had already found thousands of serious vulnerabilities spanning all major OS and browsers.
While the frontier model has proven benefits across identifying previously unknown software vulnerabilities (including 16- and one 27-year-old vulnerability), generating potential exploit paths, and recommending security fixes, it remains unreleased to the general public due to concerns that it could be misused by attackers.
Many consider it the current epitome of AI fighting AI, or fighting fire with fire, pitting the most capable and powerful model against the increasing volume and sophistication of attacks made possible by AI itself.
Because BT’s network underpins large parts of the UK’s infrastructure, it means getting on board will have far-reaching benefits for consumers and businesses. The company boasted that it now prevents four million cyberattacks across its networks every single day, and that’s before it gets on board with Project Glasswing.
“By joining Project Glasswing, BT will strengthen its own cyber security capabilities to protect our network, our customers and the wider UK,” added BT Business CEO Jon James.
Inside Anthropic’s plans to expand Project Glasswing
A few weeks after the project was launched, more than 10,000 vulnerabilities of high or critical severity have been identified.
On June 2, Anthropic Mythos expanded access to 150 new organizations across more than 15 countries, which reportedly include Australia, Canada, France, Germany, Italy, Switzerland, Netherlands, Spain, Belgium, Sweden, India, Japan, New Zealand, and South Korea (as of The Times of India).
Participants now span telecommunications, energy, healthcare, government and more. At launch, the Claude manufacturer already stated that it was “in ongoing discussions with US officials” about how the Clade Mythos Preview could help its offensive and defensive strategies.
“Governments have a significant role to play in helping to maintain this lead and in both assessing and mitigating the national security risks associated with AI models,” the company added, expressing an appetite to work with local, state and federal representatives.
Looking ahead, Anthropic predicts that developers could have access to similarly capable models within the next six to 12 months with sufficient safeguards in place so they don’t amplify the threat they were designed to tackle.
Separately, the government revealed that BT had agreed to “share data and insights about how [it’s] using artificial intelligence in the workplace” to help guide wider workplace rollouts
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