Breaking

US Commerce Department Bars Foreign Nationals From Anthropic's Claude Fable 5 and Mythos 5

June 15, 2026 at 21:19 EDT

Policy & Regulation
Foundation Models
Security

On June 13, 2026, the US Commerce Department issued an export-control measure barring Anthropic's latest AI models, Claude Fable 5 and Claude Mythos 5, from being provided to foreign nationals. Anthropic disabled access to both models the same day and has since flown technical and safety staff to Washington, DC, to continue talks with officials.

June 12, 2026 · Anthropic

Anthropic Pulls Fable 5 & Mythos 5 Worldwide After Federal Export-Control Order

Hours after a U.S. Commerce Department order barred access by "any foreign national," Anthropic disabled both frontier models globally — then sent its security leadership to Washington on June 16 for in-person talks.

JUN 9

Fable 5 (public) & Mythos 5 (restricted) released

→

JUN 12

Commerce export order → models disabled globally

→

JUN 16

Security leadership meets officials in Washington

Platforms shut off at once (AWS, Google, Microsoft, Snowflake, Box, API)

Harmful single-turn jailbreaks in 1,000+ hrs / 30 tests

100+

Experts signed open letter warning of lost edge over China

Senior Engineer benchmark — score out of 100

Fable 5 led rivals by a wide margin before the shutdown

Fable 5
Public release

Opus 4.8
Existing

GPT-5.5
Competitor

The trigger

A "fix this code" jailbreak — having the model patch vulnerabilities in a specific codebase — was judged a national-security risk.

Escalated by Amazon's CEO directly to Treasury, Commerce & the National Cyber Director

First substantial use of export controls on high-cyber frontier models

Anthropic's view

Calls the order a "misunderstanding," says the jailbreak was narrow and the government has not given sufficient technical evidence. Early users called Fable 5 the most capable coding model.

Government / risk side

Cites communication breakdowns and "recklessness." Resolution may require "deemed export" controls; a prolonged process risks becoming a de facto licensing regime. China's Zhipu shipped GLM-5.2 amid the gap.

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