Anthropic has abruptly suspended access to its advanced language models, Fable 5 and Mythos 5, following a government-issued export control directive. This suspension affects all users, both domestic and international, including Anthropic’s own foreign national employees. The directive follows the identification of a method to bypass the models’ safeguards, though the vulnerabilities discovered were limited and also present in other large language models.
BREAKING 🔥: US government directed Anthropic to ban access to Claude Fable 5 and Claude Mythos 5 to non US citizens and organisations.
— 🚨 AI News | TestingCatalog (@testingcatalog) June 13, 2026
Presumably, as these models are still vulnerable to jailbreaks. According to Anthropic, no universal jailbreak has been found so far, only… https://t.co/oRHu89ftpj pic.twitter.com/axdW0h5dQG
Fable 5 and Mythos 5 had previously undergone extensive testing in collaboration with the US government, the UK AISI, and various third-party organizations, with a focus on mitigating cybersecurity risks through rigorous safeguards and monitoring policies. Compared to previous models, Fable 5 introduced a defense-in-depth approach and stricter data retention requirements, aiming to reduce the likelihood and impact of jailbreaks.
AI Community reactions & comments
The US government forced Anthropic to shut down Fable 5 and Mythos 5 yesterday - an export control directive citing national security and a jailbreak. Access was cut for everyone, including internal, behind-closed-doors use.
— Kol Tregaskes (@koltregaskes) June 13, 2026
The “evidence” was verbal only - no specifics, no… pic.twitter.com/8zhOQb0dPN
According to Grok, Andrej Karpathy is an EB-1 extraordinary ability green card recipient, not a US citizen. Thus under these new restrictions he is not permitted to use, or work on, Mythos 5 or Fable 5 as of 5:21pm tonight. https://t.co/cm5VhCCBx3
— Andrew Curran (@AndrewCurran_) June 13, 2026
US government directive to suspend access to Fable 5 and Mythos 5. To explain in detail why this is a precedent. My personal assessment:
— Chubby♨️ (@kimmonismus) June 13, 2026
- Firstly, because it's the first time a government has directly intervened in the release of a model. The reason given is that another… https://t.co/oF0Ae0vM33 pic.twitter.com/UqJ0crQnyw
Unprecedented.@BrianRoemmele warned everyone for the past two years that the government would take away our AI.
— Robert Scoble (@Scobleizer) June 13, 2026
That day just arrived.
Was talking with an entrepreneur in San Francisco who was running Fable to build software and just turned it off while it was building.… https://t.co/R3UALmb3X5
This is big: all access to Mythos and Fable AI models disabled for everyone outside America.
— Sridhar Vembu (@svembu) June 13, 2026
First thoughts:
1. Technology is the ultimate weapon. National sovereignty, national security, all of it is now about technology.
2. Globalization is dead and Bharat must find her… https://t.co/kCQpq93D3r
This is your wakeup call.
— Alex Finn (@AlexFinn) June 13, 2026
Anthropic just took down Fable 5. It's over.
Here's the thing tho: no company or government will EVER be able to take away your local models.
There are Opus level models you can run right now on your home GPUs, and nobody can ever stop you from using… https://t.co/I6dUYeeOuG
Anthropic, an AI company known for prioritizing safety and transparency in its model development, had released Fable 5 and Mythos 5 to a broad customer base. The models were positioned as among the most secure in the industry, with safeguards considered more restrictive than those found in many competing offerings. The company maintains that the current vulnerabilities do not warrant such a sweeping suspension and has voiced concerns about the broader implications for the AI sector if similar standards are applied universally.
Anthropic is currently working with authorities to clarify the situation and to restore service to its customers as soon as possible.
