Anthropic Suspends Access to Fable 5 and Mythos 5 AI Models Amid National Security Directive
New Delhi: Anthropic has curtailed access to its state-of-the-art Fable 5 and Mythos 5 AI models following a US government export control directive citing national security issues.
This mandate prohibits access for all foreign nationals, both within and outside the United States, which critically affects even the firm’s own non-U.S. employees.
This decisive action transpired on June 13, 2026 (IST), subsequent to receiving a directive at 5:21 PM ET. While specific details were not disclosed, Anthropic suspects that this directive is associated with an alleged method of “jailbreaking” its Fable 5 model.
The US government, citing national security authorities, has 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.
The net effect of…
— Anthropic (@AnthropicAI) June 13, 2026
US Order Impacting Anthropic’s Latest AI Offerings
According to a blog post from Anthropic, “The net effect of this order is that we must abruptly disable Fable 5 and Mythos 5 for all our customers to ensure compliance.”
The repercussions are particularly dire for users outside the US and foreign nationals within the nation, as they can no longer utilize these sophisticated models.
This sudden interruption is notably harsh for Indian users and enterprises testing these technologies.
Moreover, Anthropic indicated that they reviewed evidence concerning the jailbreak method, describing the vulnerabilities identified as “previously known” and “minor.” They also noted that analogous flaws are apparent in other publicly accessible AI models.
As a result of a US government directive, we are suspending access to Claude Fable 5 for all users. You can continue to use all other Claude models.
Here’s what this means for you:
Across Claude products, new sessions will run on your selected default model or Opus 4.8, and… https://t.co/YJTiDotS2v
— ClaudeDevs (@ClaudeDevs) June 13, 2026
Anthropic Responds to Security Allegations
Anthropic asserts that its protective measures for Fable 5 underwent extensive scrutiny, with thousands of hours dedicated to testing alongside the US government, the UK’s AISI, private third-party assessors, and their internal teams.
The company contends, “No testers have yet been able to find a universal jailbreak.” They also opined that achieving flawless jailbreak resistance may be elusive for any AI firm presently operating in this domain.
Anthropic further relayed that the government has provided them with “verbal evidence” regarding a specific jailbreak incident, which involved the model being instructed to analyze a codebase and rectify software flaws.
We fully support @POTUS and @SecWar in prioritizing national security and the security of our warfighters, DIB partners, critical infrastructure, international partners and allies. Some things are simply more important than revenue cycles, clickbait, and pre-IPO valuation.… https://t.co/GU9kkHqiOu
— DoW CIO Kirsten Davies (@DoWCIODavies) June 13, 2026
IPO Considerations Heighten Business Stakes
This directive coincides with reports that Anthropic had confidentially filed for a US Initial Public Offering (IPO) last month, placing it in a competitive position against OpenAI for access to the capital markets.
Kirsten Davies, the Chief Information Officer of the US Department of War, emphasized, “Some things are simply more important than revenue cycles, clickbait, and pre-IPO valuation. America First. Always.”
pic.twitter.com/YUUukohvUx
— jack (@jackbutcher) June 13, 2026
This order presents a significant business and policy challenge for Anthropic. However, the more considerable upheaval lies with countries and corporations beyond US borders, which have now been abruptly denied access to a premier AI model—especially poignant amid ongoing global discussions surrounding sovereign AI and regulatory control over vital technologies.
Siddharth Shankar is an investigative journalist with over a decade of expertise spanning business, technology, science, gaming, automobiles, and digital media.
He currently heads the newsroom, focusing on Business, Technology, AI, Cybersecurity, and Automobile reporting.
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