The AI Daily Brief: Artificial Intelligence News and Analysis Fable 5 Shut Down by US Government
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Jun 13, 2026 Breaking news about a government order that forced a major AI model shutdown for foreign users. Coverage of the company response and a reported narrow jailbreak that triggered action. Examination of who found the vulnerability and how it reached regulators. Wide industry debate over overreach, blame, and what this means for future model releases, partnerships, and global AI control.
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Government Used Export Controls To Kill Model Access
- The US Commerce Department issued an export-control directive that forced Anthropic to disable Fable 5 and Mythos 5 for all users because foreign nationals could access them.
- Anthropic says the government pointed to a narrow jailbreak demonstration and that perfect jailbreak resistance is currently impossible, so they used defense-in-depth and monitoring instead.
Anthropic Says Jailbreak Was Narrow And Already Known
- Anthropic contends the reported jailbreak was narrow, previously known, and replicable on other models like GPT 5.5, not a universal bypass.
- They required 30-day customer data retention and red-teamed Fable extensively to detect and mitigate jailbreaks quickly.
Amazon Researchers Reportedly Found The Prompt Jailbreak
- Reporting suggested Amazon researchers (Project Glasswing) discovered prompt chains that extracted security-vulnerability information from Anthropic models.
- The Wall Street Journal tied the jailbreak research to Amazon, though it didn't confirm who notified the government.