The US Commerce Department said on June 30 that it had lifted the export license requirements imposed on Anthropic's frontier models Mythos and Fable, and the company announced it would restore access starting July 1. The move rescinds national-security restrictions that had been issued only about three weeks earlier, following an agreement between the government and Anthropic, as TechCrunch reported.
June 30, 2026 · US Commerce Department · Anthropic
US Lifts Export Restrictions on Anthropic's Frontier Models
National-security curbs on the Mythos and Fable models — imposed only about three weeks earlier — were rescinded after a new government agreement, with access restored starting July 1.
~18 days
From restriction (Jun 12) to full lift (Jun 30)
1M
Token context window on both models
2
Models affected — Fable 5 & Mythos 5
Two models, one base — different safeguards
Claude Fable 5
General use · robust safeguards
Blocks or redirects high-risk biology, chemistry & cyber queries. Broadly available via Claude API, AWS Bedrock, Vertex AI, Microsoft Foundry.
$10 in / $50 out per 1M tokens
Claude Mythos 5
Trusted partners only · some safeguards removed
Enhanced cybersecurity capability, incl. vulnerability & zero-day discovery. Limited access via Project Glasswing and select partners.
Same pricing as Fable 5
Why they were restricted
Cyberattack misuse fears (zero-day discovery)
Advanced biology research capability
Cases where Fable 5 safeguards were bypassed
Concerns raised by major investor Amazon
Terms of the lift
Anthropic to proactively detect & address risks
Cooperate on protocols, standards, future releases
Report malicious activity to the government
Preserve US AI competitiveness vs Asian rivals
Timeline of the reversal
Jun 9
Fable 5 & Mythos 5 released
→
Jun 12
Export directive — access suspended for all users
→
Jun 26
Restrictions partially eased for Mythos
→
Jun 30 – Jul 1
Curbs fully lifted; access restored
Praise from developers
Handled most tasks thrown at it, with state-of-the-art claims in software engineering and scientific research.
Criticism
Safeguards called overly conservative — rejecting basic biology questions (e.g. mitochondria); some argued output degradation was anti-competitive.
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