Around June 27, 2026, the US Commerce Department authorized limited access to Anthropic's cyber-focused AI model "Claude Mythos 5" for more than 100 US organizations, including Fortune 500 companies, critical infrastructure operators and government agencies. The move partially eased access that had been fully suspended roughly two weeks earlier.
June 26, 2026 · Anthropic
Top Cyber AI "Mythos 5" Switched Back On — For a Chosen Few
After a government notification, Anthropic is restoring its suspended elite cybersecurity model to a limited set of US organizations defending critical infrastructure. Its general-use twin, Fable 5, stays locked down.
100+
Trusted US orgs regaining access — incl. Fortune 500 firms & federal agencies
~$1,000s
Compute cost to craft a working exploit from a CVE in testing
30-day
Data retention for safety monitoring — a cited practical concern
A 14-day round trip: launch → freeze → partial restart
Both models share one foundation, but only Mythos 5 has come back online.
JUN 9
Unveiled together
Fable 5 & Mythos 5
→
JUN 12
Full suspension
Export-control compliance
→
JUN 26
Mythos 5 restored
Limited US critical-infra
Two models, one foundation
Mythos 5
limited edition
Purpose: Top-tier cyber defenseSafeguards: Partially removedStatus: Limited restart Price: from $10 / $50 per 1M tokens
Fable 5
general / enterprise
Purpose: General & enterprise useSafeguards: Added guardrailsStatus: Still restricted Price: from $10 / $50 per 1M tokens
The case for restart
World-class defensive value — finds zero-days in major OSes and browsers, and an early version helped Mozilla fix hundreds of security bugs.
The concerns
Non-US users — especially in Asia — are locked out, fueling "sovereign AI" calls. Access can be cut overnight, and data is retained 30 days.
A snapshot of the tug-of-war between tightening AI export controls and preserving US AI leadership.
Full restoration of Fable 5 — or any further expansion of trusted access — has not been confirmed.
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