- BT is the first UK company to join Anthropic’s Project Glasswing
- High-risk Claude Mythos Preview model is limited to select partners only
- UK infrastructure set for major security boost – BT already blocks 4 million daily attacks
BT has become the first UK company to publicly confirm its membership in Anthropic’s Project Glasswing, a cybersecurity initiative that gives partners access to the company’s most advanced cybersecurity model, 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 its customers’ systems against sophisticated and evolving attacks.
“AI only works at scale when it is supported by future-proof networks that are secure, resilient and secure,” Kirkby said, pledging to “work with the government to support the further development and deployment of Britain’s sovereign AI capability, so that the UK can be an AI maker and not just a recipient.”
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 high-severity vulnerabilities spanning all major operating systems and browsers.
While the frontier model has demonstrated benefits in identifying previously unknown software vulnerabilities (including vulnerabilities from 16 and 27 years ago), generating potential exploitation paths, and recommending security patches, it remains unreleased to the general public for fear that attackers could misuse it.
Many consider it to be 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 that AI itself has enabled.
With BT’s networks underpinning much of the UK’s infrastructure, it means that joining them will have far-reaching benefits for consumers and businesses. The company boasted that it now prevents four million cyberattacks on its networks every day, and that’s before joining Project Glasswing.
“By joining Project Glasswing, BT will strengthen its own cybersecurity capability to protect our networks, our customers and the UK as a whole,” added Jon James, chief executive of BT Business.
Inside Anthropic’s plans to expand Project Glasswing
A few weeks after the project was launched, more than 10,000 high or critical severity vulnerabilities were identified.
On June 2, Anthropic expanded access to Mythos to 150 new organizations in more than 15 countries, reportedly including Australia, Canada, France, Germany, Italy, Switzerland, Netherlands, Spain, Belgium, Sweden, India, Japan, New Zealand, and South Korea (according to The times of India).
Participants now span telecommunications, energy, healthcare, government and more. At the launch, Claude’s manufacturer already stated that it was “in ongoing discussions with US government officials.” on how Clade Mythos Preview could help your offensive and defensive strategies.
“Governments have an essential role to play in helping to maintain that leadership, and to both assess and mitigate the national security risks associated with AI models,” the company added, expressing its desire to work with local, state and federal representatives.
Looking ahead, Anthropic predicts that developers could gain access to models with similar capabilities within the next six to 12 months with appropriate safeguards so that they do not amplify the threat they are designed to address.
Separately, the Government revealed that BT had agreed to “share data and ideas about how [it’s] Using AI in the Workplace” to help guide broader workplace implementations
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