The US government is reportedly requiring Anthropic to make its frontier model "Claude Fable 5" "impossible" to jailbreak as a condition for rerelease — a demand security experts say cannot be met.
June 2026 · Export-Control Shutdown
A Brand-New Frontier AI, Pulled Offline Days After Launch
Anthropic suspended global access to Claude Fable 5 and Mythos 5 after a US Department of Commerce export-control directive. The White House's condition for re-release — make the models impossible to jailbreak — is something security experts say cannot be done.
~3 days
From June 9 release to June 12 shutdown order
100%
Of users cut off — a foreign-access ban became a global shutdown
1M
Token context window (128K max output)
Two models, released together — both now suspended
The "safe" public model vs. the restricted high-risk variant
Claude Fable 5
PUBLIC · SAFE VERSION
Availability — Consumer-facing
Claude Mythos 5
RESTRICTED · HIGH-RISK
Availability — Select orgs (Project Glasswing)
Core fear: that Fable 5 — via jailbreak — could reach Mythos-level cyberattack capabilities.
How a narrow concern became a total shutdown
DIRECTIVE
Commerce orders foreign-national access cut off — including Anthropic's own staff
→
REALITY
Blocking foreign access is effectively impossible to isolate
→
RESULT
All users worldwide lose access to both models
During the brief window
Developers called it a generational leap
Praised for speed, accuracy and grasp of key points
Standout on agentic, long-horizon tasks
The pushback
Anthropic: jailbreak evidence was only "verbal," narrow, non-universal
Experts: perfect jailbreak resistance is technically impossible
Critics: an overreaction not severe enough for export controls
As of June 17
Both models remain suspended while Anthropic and the government negotiate a possible re-release.
Clashes between AI safety and government regulation are not new — but forcing the immediate, global shutdown of entire frontier models is unusual.
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