[UPDATE] Anthropic Says Fable 5 Could Return Within Days

Anthropic says the two AI models the United States ordered offline last week could return to customers within days, even as fresh reporting fills in why Washington pulled them in the first place. The answer points to a South Korean telecom, a decades-old corporate link to China, and a security flaw flagged by Amazon.

The story so far: on June 12 the US Commerce Department issued an export-control directive that barred access to Claude Fable 5 and its restricted sibling Claude Mythos 5 by "any foreign national, whether inside or outside the United States." Because Anthropic could not reliably tell foreign nationals apart from other users in real time, it switched both models off for everyone, worldwide. We covered the original suspension when Washington first issued the order, and the company's scramble to negotiate a path back.

What set the ban off

According to Fortune and Tech Times, the trigger was SK Telecom, South Korea's largest carrier and a reported $100 million investor in Anthropic. SK Telecom had secured early Mythos access through Project Glasswing after joining a wave of roughly 150 partner organizations. The White House grew uneasy about its parent, SK Group, which held a stake in China Unicom until 2009. The administration told Anthropic to revoke SK Telecom's access, and the company did so immediately.

What turned a single revocation into a blanket ban was a second event. Researchers at Amazon, Anthropic's largest backer, flagged vulnerabilities in Fable 5 that could let a determined user coax unsafe behavior out of the model. With a national-security case already open, the directive widened to cover every foreign national, and the practical result was a global shutdown.

A standoff over jailbreaks

The sticking point now is security. Reports say David Sacks, who co-chairs the President's advisory council on AI, gave Anthropic a choice: prevent the jailbreaks or take Fable 5 down. Chief executive Dario Amodei declined both framings, and the model went dark under the export order instead. The administration is said to want comprehensive jailbreak prevention before either model returns.

That demand runs into a hard technical fact. No one has built a frontier model that resists every jailbreak, and most researchers think no one can, at least not yet. A guarantee of zero successful attacks is closer to a wish than a specification, which is part of why Anthropic and Washington are still talking rather than shipping a fix.

Anthropic plants a flag in Seoul

While the negotiation continues, Anthropic spent the week deepening its presence in the country at the center of the dispute. It opened a Seoul office, its third in the Asia-Pacific region after Tokyo and Bengaluru, and signed a memorandum of understanding with South Korea's Ministry of Science and ICT on AI safety. Chris Ciauri, the company's managing director for international markets, told reporters the firm is "very confident that in the coming days, the models will become available again."

The visit also showed how much of corporate Korea already runs on Claude. NAVER is rolling out Claude Code across its engineering organization, Samsung SDS is deploying Claude Cowork and Claude Code inside Samsung Electronics, and LG CNS, Nexon and Hanwha Solutions have announced deployments of their own. Those products lean on Claude Opus 4.8 and Claude Code, which were never part of the export order, so the enterprise rollouts have carried on while Fable 5 and Mythos 5 sit idle.

The bill for a vanished model

For paying customers, the practical fallout arrives this weekend. Anthropic is refunding people who bought access to a product that disappeared almost overnight, and the refund window closes on June 20. A separate grace period for affected subscribers runs slightly longer. The company has also doubled usage limits on Claude Cowork at no extra cost, a gesture aimed at customers left without the model they signed up for.

If Anthropic is right about the timeline, Fable 5 and Mythos 5 could be back in service before the end of the month. If the talks stall on the jailbreak question, the most capable model the company has ever released will stay offline over a flaw that may have no clean fix. Either way, the episode has handed open-weight rivals a talking point: a model you host yourself cannot be switched off by anyone else.