The Trump administration in June 2026 imposed export controls on Anthropic's latest AI model, "Fable 5" (and the related "Mythos 5"), forcing Anthropic to halt access for all of its customers worldwide, according to reports. The move pits the US push to export AI against security-driven export restrictions head-on.
June 2026 · US Commerce Department
Washington Slaps Export Controls on Anthropic's New Models — and They Go Dark Worldwide
After a jailbreak was found in Fable 5 that could expose cyberweapon-grade capabilities, the Commerce Department barred all foreign access. To comply, Anthropic disabled both Fable 5 and Mythos 5 — for every customer, everywhere.
2
models cut off — Fable 5 & Mythos 5
100%
of customers blocked, worldwide
~$13B
Amazon investment — the investor that flagged the jailbreak
How 24 hours led to a shutdown
1 · Jailbreak found
Amazon discovers a bypass of Fable 5's guardrails, reports it to government
→
2 · Risk judged
Bypass could expose Mythos-level cyber capability — deemed cyberweapon-grade
→
3 · Patch refused
White House asks for a voluntary patch or pause — Anthropic declines
→
4 · Controls imposed
All foreign access barred; Anthropic disables both models worldwide
A policy at odds with itself
The same administration promoting US AI exports just cut off a core American model.
JULY 2025 · EO 14320
"Promoting the Export of the American AI Technology Stack" — exports hardware, models, software & standards
JUNE 2026 · The reversal
A flagship US model is abruptly disabled for everyone — days before the export program's June 30 deadline
Anthropic's defense
Jailbreak was narrow and non-universal
Similar capability is public in models like GPT-5.5
Issue "not serious"; cites lack of transparency
The critical view
Officials call it a cyberweapon-grade risk
Sets a precedent: access can be cut overnight
Risks "picking winners," unsettling allies & global customers
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