Anthropic has taken its latest frontier models, Claude Mythos 5 and Fable 5, completely offline after the Trump administration imposed export controls barring foreign nationals' access. One trigger, reports say, was access granted to SK Telecom, South Korea's largest carrier and an Anthropic investor.
June 2026 · US Export Control
US Order Forces Anthropic to Pull Its Frontier Models Offline Worldwide
A Commerce Department / White House directive restricted foreign access to Claude Fable 5 and Mythos 5 — prompting Anthropic to suspend both models globally, days after Fable 5's launch.
2
Frontier models suspended globally (Fable 5 & Mythos 5)
~150
Glasswing organizations across 15+ countries
$100M
SKT's 2023 investment in Anthropic (~$5B valuation)
How the chain unfolded — June 2026
~JUN 4
SKT announces it joined Project Glasswing, gaining early Mythos access
→
~JUN 9
Fable 5 released; jailbeak extracting cyberattack info reported to White House
→
JUN 12–15
Export-control directive issued → both models suspended worldwide
Scope of the controls — an unprecedented expansion
Comparable reach, same scale — from targeting one firm to a broad allied-nation suspension applied to the model itself.
Prior norm
Restrict specific
→
This action
Broad global suspension
What drew interest
State-of-the-art autonomous multi-day tasks, coding and knowledge work. Mythos reportedly found thousands of zero-day vulnerabilities within weeks.
What raised concern
A jailbreak surfaced right after Fable 5's launch, and the directive questions the stability of building on frontier models now subject to regulation.
The reported flashpoint
An access list Anthropic submitted included SK Telecom — South Korea's largest carrier, an Anthropic investor — flagged over suspected China ties.
SKT denies any China ties and says it uses no Huawei equipment in its core network, noting reports based on anonymous sources are difficult to verify.
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