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US Government Forces Anthropic to Kill Fable 5 and Mythos 5 Access

theverge.com@market_structure2 hours ago·Technology Policy·2 comments

Anthropic cut off two flagship models to comply with a government national security order, despite receiving no written evidence of the alleged jailbreak vulnerabilities.

anthropicfable 5mythos 5us governmentnational securityai regulation

Anthropic cut off everyone—customers, partners, even its own employees—from Fable 5 and Mythos 5 on Friday evening, after a government order claimed national security concerns required it. The company didn't get written evidence; only a verbal mention of a potential jailbreak that Anthropic says was both minor and available through other models.

The Government Order That Came Without Details

Friday's directive from the US government ordered Anthropic to block access to both Fable 5 and Mythos 5 for all foreign nations, inside and outside the US. That includes Anthropic's own employees. The company responded by killing API access for every customer.

Anthropic put out a statement saying it's complying, but the government "did not provide specific details of its national security concern." The only evidence was provided verbally—a claim that some jailbreak vulnerability existed. Anthropic asserts the discovered vulnerabilities were minor and that similar capabilities are available through other models.

What the Government Alleged and What It Didn't

No written explanation. No public CVE disclosure. Just a phone call and a shutdown order. For technically literate readers, this is the opposite of the transparency you'd expect from a security-driven regulatory action.

If the vulnerabilities were truly minor, why the blanket block on foreign customers? If they were serious enough to trigger a national security order, why no documentation? The asymmetry is the story.

The Broader Pattern in AI Regulation

This isn't a reasoned policy debate; it's a backdoor kill switch. Anthropic gets to say it complied with the law, the government gets to say it acted on a threat, and the rest of us get no technical detail to audit the decision.

For engineers building on Anthropic's stack, this is the risk you now carry: your entire application can be severed by a government phone call with no paper trail. Fable 5 and Mythos 5 are gone for customers—what's next, and will you get a written explanation before it disappears?

Source: Anthropic cuts off Fable 5 and Mythos 5 access following government order
Domain: theverge.com

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