South Korea's ambition to build a gigawatt-scale artificial intelligence cloud collided with American export controls this month when the White House ordered Anthropic to suspend foreign access to Mythos 5 and Fable 5 — days after SK Telecom joined the company's Project Glasswing initiative. The sequence illustrates how U.S. frontier-model policy can override allied industrial strategies with little advance notice.
SK Telecom and Nvidia announced their domestic AI cloud partnership on June 7. By June 12, officials had directed Anthropic to revoke Mythos access for the carrier, citing alleged ties to China that SK Telecom denied. A subsequent jailbreak report on Fable 5 triggered a global shutdown affecting even Anthropic's non-U.S. employees.
Seoul's Dilemma
President Yoon Suk Yeol's administration invested heavily in AI as an economic growth pillar, offering tax incentives for data centers and domestic model development. SK Telecom positioned itself as the national champion connecting Korean enterprise demand to American frontier technology.
Trade ministry officials said they requested clarifications from Washington through diplomatic channels but received no public timeline for restoring access. Domestic startups relying on Anthropic APIs halted product tests, switching temporarily to open models with weaker Korean-language performance.
Washington's Rationale
U.S. officials concluded that advanced models capable of sophisticated cybersecurity assistance pose proliferation risks if foreign actors bypass guardrails. Anthropic had previously urged tighter export controls in a 2025 Commerce Department filing, arguing compute and model access must stay aligned for national security.
The irony that Anthropic now faces the broadest restrictions among major labs is not lost on Seoul policymakers. Some Korean lawmakers called for accelerated funding of local LLM efforts by Naver and Kakao, though those models remain behind frontier U.S. systems on benchmark evaluations.
Alliance Friction
Japan and the European Union face parallel dependency on American AI stacks while joining U.S.-led chip coordination through Pax Silica. Allied capitals increasingly ask whether security reviews will distinguish trusted partners from adversaries or apply blanket foreign-national bans.
State Department spokespeople said the United States values Korea as an ally but declined to discuss SK Telecom specifics. Pentagon officials tied model access to end-user verification procedures still being negotiated with several labs.
Commercial Consequences
Nvidia said its SK Telecom infrastructure deal proceeds independently of Anthropic software choices, though integrated product roadmaps assumed joint offerings. Cloud revenue forecasts for Korean operators may shrink if frontier API access remains uncertain through 2027.
Anthropic continues private negotiations to restore limited access under citizenship and facility-security requirements modeled on classified defense contracting. Until then, South Korea's AI strategy must proceed without the models its largest carrier bet on — a cautionary tale for any U.S. ally planning national clouds atop American frontier systems.
