76 Cybersecurity Experts Urge US to Lift Anthropic Model Ban Over Security Risks
Updated
Updated · TechCrunch · Jun 15
76 Cybersecurity Experts Urge US to Lift Anthropic Model Ban Over Security Risks
3 articles · Updated · TechCrunch · Jun 15
Summary
An open letter signed by 76 cybersecurity experts asked Washington to reverse Friday’s export-control order on Anthropic’s Fable and Mythos models, arguing it strips defenders of top tools for finding and fixing software flaws.
Anthropic suspended access worldwide after the order, which cited national security concerns without public detail and may have relied on a disputed report claiming Fable could be jailbroken into Mythos-level capabilities.
Katie Moussouris said the Amazon paper she reviewed did not show a real jailbreak, but rather normal defensive use—asking the model to repair vulnerable code, explain fixes and write tests.
The letter says similar behavior can be reproduced on GPT-5.5, Anthropic’s Claude Opus 4.8 and Sonnet, and Chinese model Kimi 2.7, calling for transparent, science-based rules narrowly tailored to public safety.
How can the US balance AI leadership against the security risks of its own powerful models?
Are US restrictions on its AI companies inadvertently paving the way for China's tech dominance?
U.S. Bans Anthropic’s Claude Fable 5 and Mythos 5: National Security, Industry Backlash, and the Future of AI Rivalry with China
Overview
In June 2026, the Trump administration imposed sweeping restrictions on Anthropic's most advanced AI models, Claude Fable 5 and Claude Mythos 5, just days after Anthropic’s CEO called for stronger AI regulation. Anthropic responded by suspending access to these models, citing concerns over their immense capabilities, especially Mythos’s ability to perform superhuman feats of hacking. To address risks, Anthropic had released Fable 5 as a safer, guardrailed version, but this did not prevent government action. The crisis highlights the tension between rapid AI innovation, national security fears, and the challenge of balancing safety with technological progress.