Fable 5 and Mythos 5 Are Down. Here Is What We Know About When They Come Back.

The Short Version

Claude Fable 5 and Claude Mythos 5 are currently offline for all users worldwide. The US government, citing national security authorities, issued an export control directive to suspend all access to Fable 5 and Mythos 5 by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees -- and the net effect of that order was that Anthropic disabled both models for all customers to ensure compliance. As of the morning of June 15, there is no public restoration date.

What Happened

Fable 5 launched on June 9 as the most powerful model Anthropic had ever released to the public, only to face government takedown 72 hours later -- the first time a US AI lab has been forced to pull a generally available model.

Commerce Secretary Howard Lutnick sent a letter to Anthropic CEO Dario Amodei on June 12 stating that Mythos 5 and Fable 5 would be subject to export controls to any location outside the US and to all foreign persons within the country. Anthropic received the directive at 5:21pm ET and suspended both models the same evening.

Because the order reaches foreign nationals everywhere, including Anthropic's own employees, the company said the only way to comply was to turn the models off for everyone. Every other Anthropic model remains unaffected.

The Jailbreak Claim

An administration official told Axios the Commerce Department acted after another company claimed it could jailbreak Mythos, alarming the administration about possible national security risks. A person close to the White House said Amazon informed the government about the jailbreak, and that its CEO, Andy Jassy, had been in contact with members of the administration about it.

The timing raises uncomfortable questions. Amazon is both a major Anthropic investor and cloud distribution partner, yet it apparently triggered a shutdown that directly undermines its investment. The episode exposes the administration and industry's reactive approach to a technology moving faster than policy can accommodate, and raises questions about why Amazon would strike such a disruptive blow against a company in which it is a major investor.

The administration had tried to get Anthropic to pause releasing the latest models but was unsuccessful, the official said, prompting the export control letter.

Anthropic's Response

Anthropic complied with the order but disputed the underlying premise. Anthropic reviewed a demonstration of the jailbreak technique and found it exposed only a small number of previously known, minor vulnerabilities -- ones that other publicly available models can also discover.

In the weeks before launch, Anthropic conducted thousands of hours of red-teaming with the US government, the UK AISI, multiple private third-party organizations, and internal teams. Those tests showed Fable's safeguards substantially outperform those of any previously deployed model.

Anthropic stated: "We believe the government should have the ability to block unsafe deployments, as part of a statutory process that is transparent, fair, clear, and grounded in technical facts. This action does not adhere to those principles."

In conversations with the administration, Anthropic officials argued the alleged Amazon jailbreak was relatively simple, achievable with other models, and did not demonstrate a flaw in Fable 5's safety systems.

The timing of Amodei's June 10 blog post complicates the narrative. He had just published a piece titled "Policy on the AI Exponential," pointing to Mythos as an "emblematic example" of threats frontier models pose to national security, and writing: "We need to activate a slow and rickety policy apparatus to deal with risks and opportunities that are going to compound surprisingly quickly from here."

When Will Access Return?

No one has a firm answer. Anthropic's suspension page states: "We apologize for this disruption to our customers and are working to restore access as soon as possible."

There is currently no official timeline for restoration. Media reports suggest it could take a few weeks; complex compliance challenges may delay it further; and restoration by June 20 appears extremely unlikely.

The government's path to resolution remains opaque. The export control directive cited national security concerns regarding potential jailbreaking, specifically targeting access by any foreign national. But because Anthropic cannot reliably distinguish users in real-time, it disabled the models for everyone. Solving that verification problem -- if that's what the government requires -- presents a non-trivial engineering and compliance challenge with no published specification.

The suspension also disrupts Anthropic's existing commitment. Fable 5 was included on Pro, Max, Team, and seat-based Enterprise plans at no extra cost through June 22, after which Anthropic intended to restore it as a standard subscription feature once capacity allowed. That capacity constraint is now irrelevant; the government directive has superseded it entirely.

Prior Tensions

This suspension follows earlier friction between Anthropic and the current administration. In March 2026, Secretary of Defense Pete Hegseth labeled Anthropic a "supply chain risk" after the company refused to allow the military to use Claude for mass domestic surveillance and lethal autonomous weapons without safety restrictions. The fallout led to a sweeping prohibition on Anthropic's use across defense supply chains.

The White House partly imposed the June 12 export controls over suspicions that a China-linked group had accessed Mythos, and directed Anthropic to limit access to both Mythos and Fable 5 to US citizens.

When the Trump Administration notified Anthropic of the jailbreak, Dario Amodei said it posed no serious risk and refused to fix it, according to White House AI and crypto czar David Sacks. Anthropic disputes that account.

What to Do Now

Fable 5 and Mythos 5 represent the only Mythos-class capability in the Anthropic lineup. Every other Anthropic model is running normally; Opus 4.8 is the closest substitute, and for many tasks it was already the model Fable 5 fell back to behind the scenes. Fable's safeguards were already routing high-risk queries in cybersecurity, biology, chemistry, and distillation to Opus 4.8 anyway.

For teams that deployed Fable 5 in production or built on Mythos 5 through Project Glasswing: plan for indefinite unavailability. The honest answer is nobody knows when access returns. Restoration depends on government negotiation, a compliance architecture for real-time nationality verification, or a directive reversal -- none of which has a stated timeline.

The White House's improvisation on what appears to be the first real test of what to do about a frontier model's risks may ultimately imperil its stated goal to ensure American leadership in AI. That is cold comfort to engineering teams with broken pipelines today.