Cybersecurity vets protest ‘dangerous’ US government ban on Anthropic’s most powerful models
📰 ArticleLorenzo Franceschi-Bicchierai
US govt bans Anthropic's top AI models; cybersecurity experts warn it harms defense.
On June 15, 2026, a coalition of cybersecurity veterans, including Alex Stamos, Casey Ellis, and Katie Moussouris, published an open letter protesting the US government's export control order on Anthropic's Fable and Mythos models. The order, issued without specific explanation, forced Anthropic to suspend worldwide access to these models, which are touted for their exceptional ability to identify security vulnerabilities. Anthropic had previously restricted Mythos to about 150 organizations in 15 countries. The company released Fable as a public version with strict guardrails, but researchers found it blocked nearly all cybersecurity prompts. The government's action may have been prompted by a paper from Amazon researchers claiming to jailbreak Fable, though signatories like Moussouris argue it did not demonstrate a real bypass. The letter argues that removing cutting-edge AI tools from defenders weakens cybersecurity while adversaries continue to advance. The controversy highlights tensions between AI safety, national security, and the practical needs of cybersecurity professionals.
💡Highlights
- ├─76 cybersecurity experts signed open letter
- ├─US govt bans Anthropic's Fable & Mythos
- └─Defenders lose advanced vulnerability detection
🎯For
- ├─AI Researchers
- ├─Cybersecurity Professionals
- └─Policy Makers