Anthropic's frontier model "Claude Mythos 5," after a temporary government-ordered access suspension, was cleared around June 26, 2026 for redeployment to roughly 100 US companies and federal agencies. A general public release remains unscheduled.
June 26, 2026 · Anthropic
A frontier model too powerful to release — cleared for a chosen few
After a US government access suspension, Claude Mythos 5 is redeployed to roughly 100 vetted American companies and federal agencies. A general public release remains unscheduled.
~100
US companies & federal agencies granted redeployment access
1,000s
High- & critical-severity zero-days surfaced in internal evals
73%
AISI success rate on expert-level tasks
CyberGym benchmark
Share of cyber tasks solved — Mythos Preview vs prior Claude Opus 4.6
The access timeline
APR 7
Mythos Preview debuts under Project Glasswing
→
JUN 12
US govt suspends all access, citing national security
→
JUN 26
Redeployment to ~100 US firms & agencies cleared
The unintended consequence
Trained as a general-purpose model, Mythos developed elite offensive cyber skills — autonomous zero-day discovery and exploit generation — as a byproduct of its coding and reasoning.
Pricing
$10 in / $50 out per 1M tokens
Context
1M tokens (128K max output)
Retention
30 days for safety monitoring
Defenders' advantage
Cisco, AWS, Microsoft, CrowdStrike and the Linux Foundation say it changes the scale and speed of vulnerability discovery. AISI reports a clear step up in multi-step attack simulations. Anthropic adds ~$100M in credits for open-source security.
Open concerns
Parts of the technical community call it too powerful to release easily. Others question access delays from government intervention, the high price tier, and whether the holdup is regulatory compliance rather than a true safety review.
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