Around June 27, Anthropic resumed limited access to its top-tier Claude Mythos 5 model after the US Commerce Department eased export-control restrictions. Access is granted to organizations designated as trusted partners, without a license requirement.
June 27, 2026 · Anthropic
Claude Mythos 5 Returns — to a Locked-Down List of ~100 US Defenders
After the US Commerce Department eased export controls, Anthropic resumed a limited rollout of its top-tier cybersecurity model. Access is restored mainly to vetted Project Glasswing partners that defend US critical infrastructure.
~100
Companies & agencies cleared for restored access
15days
From June 12 suspension to June 27 resumption
30days
Traffic retained for safety monitoring, then deleted
SWE-Bench Pro — real-world GitHub tasks
Higher is better. Why Mythos 5 drew export-control scrutiny.
Humanity's Last Exam (tools): Mythos 5 64.5% vs Opus 4.8 57.9% .
One day vs two months
Reported Stripe migration of a 50-million-line Ruby codebase.
Praised as defense
Outclasses rivals at zero-day discovery
Strong at exploit generation for defenders
Excels at long autonomous tasks
Concerns
30-day traffic retention deters sensitive workloads
Export rules effectively confine it to the US
Safeguards blocked harmless queries in <5% of Fable 5 sessions
From release to restored access
JUN 9
Fable 5 & Mythos 5 released
→
JUN 12
Export directive forces suspension
→
JUN 27
Safeguards cleared; access restored to trusted partners
Pricing: $10 /M input · $50 /M output tokens — prompt caching cuts input cost up to 90%, Batch API up to 50%. General availability of Fable 5 remains under discussion.
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