- BT is the first UK company to join Anthropic’s Glasswing project
- The high-risk Claude Mythos Preview model is limited to certain partners only
- UK infrastructure set for major security boost – BT already blocks 4 million attacks a day
BT has become the first UK company to publicly confirm its membership of Anthropic’s Project Glasswing, a cybersecurity initiative which 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 said the partnership would help the company defend both its own networks and its customers’ systems against scalable and sophisticated attacks.
“AI only works at scale when it is supported by secure, resilient and future-ready networks,” Kirkby said, pledging to “work with the Government to support the further development and deployment of sovereign UK AI capability, so that the UK can be a creator of AI and not just a taker”.
BT joins Anthropic’s Glasswing project
Anthropic launched Project Glasswing in April 2026 with select partners in response to AI-powered attacks.
At the time, Anthropic boasted that Claude Mythos Preview had already found thousands of high-severity vulnerabilities spanning all major operating systems and browsers.
Although the frontier model has proven its benefits by identifying previously unknown software vulnerabilities (including 16- and 27-year-old vulnerabilities), generating potential exploitation paths, and recommending security patches, it has not been released 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 best and most powerful model against the increasing volume and sophistication of attacks that AI itself has enabled.
As BT’s networks support much of the UK’s infrastructure, this means the integration will bring significant benefits to consumers and businesses. The company boasted of preventing four million cyberattacks on its networks every day, before joining the Glasswing project.
“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, CEO of BT Business.
Inside Anthropic’s plans to expand Project Glasswing
Within weeks of the project’s launch, 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, including Australia, Canada, France, Germany, Italy, Switzerland, Netherlands, Spain, Belgium, Sweden, India, Japan, New Zealand and South Korea (via India Times).
Participants now span telecommunications, energy, healthcare, government and more. At launch, the Claude maker previously said it was “in ongoing discussions with U.S. government officials” about how Clade Mythos Preview could help its offensive and defensive strategies.
“Governments have a critical role to play in maintaining this lead and in assessing and mitigating the national security risks associated with AI models,” the company added, expressing its desire to work with local, state and federal officials.
Looking ahead, Anthropic predicts that developers could have access to models with similar capabilities in the next six to 12 months, with adequate safeguards in place 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 on how [it’s] using AI in the workplace” to help guide broader workplace deployments
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