US government orders Anthropic to suspend access to Fable 5 and Mythos 5 over national security

Last week the US government forced Anthropic to pull its two newest models, Fable 5 and Mythos 5, citing national security after Amazon researchers allegedly bypassed Fable 5's guardrails. Cybersecurity researchers signed an open letter calling the move dangerous, and Anthropic noted the same jailbreaks exist in other models. TechCrunch asks whether the ban is accidentally boosting the brand.

On June 12, the US government forced Anthropic to pull its newest models, Fable 5 and Mythos 5, citing national security risks after Amazon researchers claimed they bypassed Fable 5's guardrails. Cybersecurity researchers protested with an open letter, and Anthropic noted the same jailbreaks work on other models. The podcast discusses what the ban means for developers and the IPO, and why early sales data suggests it might accidentally help the company.

Anthropic staff are pushing back after the White House ordered them to take down Fable 5 and Mythos 5 within 90 minutes, citing national security. Internal chats show confusion: the stated reason shifted from foreign access risks to a major model vulnerability. Six days later, roughly 3,000 employees still lack clear answers, and CEO Dario Amodei's talks with the administration have not broken the deadlock. Workers also worry the order could hurt the company's planned IPO this year.

TechCrunch argues the US government's ban on Anthropic's latest models was never about a jailbreak. The Commerce Department invoked an export control directive on Friday, blocking non-US persons—including Anthropic's own foreign staff—from accessing Fable 5 and Mythos 5. The official reason is national security, but the article sees a reactionary, retaliatory political move. The post does not disclose specific technical details or jailbreak evidence behind the ban.

Anthropic launched Claude Fable 5 on June 9 as a guardrailed version of its Mythos-class model. Three days later the US government suspended access for all foreign nationals, citing a jailbreak risk. Anthropic couldn't cleanly enforce nationality-based access, so they shut it down entirely. shadcn's takeaway: use the best model while you have it to create durable plans and specs, then execute with something cheaper you control. Separately, Ramp released SWE-Bench built from real internal engineering problems—Fable 5 leads, but each performance bump costs 1.5x more. DeepSeek raised $7.4B in its first funding round at a $50B+ valuation, with the CEO writing ~40% of the check.

The US Commerce Department issued an export control order last Friday requiring Anthropic to block all foreign nationals—including its own non-US employees—from accessing Mythos 5 and Fable 5. Anthropic fully disabled both models and sent executives to Washington to negotiate with Treasury Secretary Bessent and Commerce Secretary Lutnick. Anthropic argues the jailbreak cited by the government is narrow and non-universal, and that OpenAI's GPT-5.5 can achieve the same capability. Amazon CEO Andy Jassy may have reported red-team findings to the government, but Anthropic says the same conclusion holds for GPT-5.5. The post doesn't disclose the status of negotiations or when the models might return.

On June 12, the White House ordered Anthropic to block foreign access to its newest models, Fable 5 and Mythos 5, launched just three days earlier. Anthropic said Fable 5 exceeds any model it has ever made generally available, while Mythos 5 uses the same base model with some safeguards lifted. The order followed Amazon-White House talks after researchers reportedly found ways to get Fable 5 to output info usable in cyberattacks. Anthropic cut access for all users, stating it complies with the legal directive but disagrees that a narrow jailbreak finding justifies recalling a model deployed to hundreds of millions. The post does not disclose the specific legal basis for the order or a timeline for restoring access.

Semafor reports the White House imposed export restrictions on Anthropic's Mythos model, citing concerns about access by China-linked groups. Another risk flagged is model capability theft via knowledge distillation. The US Commerce Department had earlier ordered Anthropic to disable Fable 5 and Mythos 5 after jailbreaks were found to elicit cybersecurity assistance. Anthropic pushed back, arguing the jailbreak is not universal and other public models offer similar capabilities. The restrictions are expected to last a few weeks while the US government strengthens national security systems. Anthropic acknowledged no model provider can currently achieve perfect jailbreak prevention.

Anthropic's top models Mythos and Fable were hit with export controls over safety concerns and taken offline. The company is now flying senior technical staff to D.C. to meet White House officials and patch things up. Both sides say they want a quick resolution, though the administration had complained Anthropic wasn't engaging seriously.

The US government barred foreign nationals from accessing Claude Fable and Mythos. The author argues Anthropic asked for this: CEO Dario Amodei had just published a piece calling for government power to block risky model deployments. The third-party assessment came from Amazon, flagging cybersecurity risk. Anthropic has pushed for stricter AI regulation for years. The post doesn't specify which countries or personnel are affected.

The US Commerce Department issued an export control order last Friday requiring Anthropic to shut down Fable 5 and Mythos 5. The trigger was a jailbreak that let the models provide cybersecurity help they were supposed to refuse. Commerce Secretary Howard Lutnick said export restrictions will apply to users outside the US and foreign nationals inside the US until national security systems are strengthened, which could take weeks. Anthropic responded that the jailbreak technique is narrow, only a few small known flaws were found, and other public models can offer similar capabilities. Because the company cannot verify user nationality in real time, it had to disable the models for everyone, including internal international team members. Anthropic also noted the industry cannot yet achieve perfect jailbreak resistance—all safeguards remain vulnerable to non-universal jailbreaks.

Anthropic blocked all foreign nationals from accessing Fable 5 and Mythos 5 after receiving a US government export control directive citing national security. The post doesn't specify which agency issued the order, whether existing enterprise deployments are affected, or if Anthropic will offer refunds or alternatives.

Anthropic abruptly disabled Fable 5 and Mythos 5 on June 13 after the US government issued an export control directive at 5:21 PM ET. The order bans access for any foreign national anywhere, including those in the US and Anthropic's own foreign employees. Anthropic says compliance is impossible without a full shutdown. The government cited a jailbreak method that found a few known, minor vulnerabilities. Anthropic pushed back, stating that other public models like OpenAI's GPT-5.5 can do the same, and defenders already use these capabilities daily. The post does not disclose the jailbreak's technical details or the full directive text. The author, an AI risk worrier, is conflicted: he agrees optimizers can go dangerously wrong, but finds this ban's justification weak.

Anthropic suspended access to Claude Fable 5 and Mythos 5 for all foreign nationals on June 13, following a US government export control directive. The models had launched only 3 days earlier. Anthropic says the order is based on verbal evidence of a narrow, non-universal jailbreak and believes it's a misunderstanding. Downstream products like Cognition Devin and Agent Arena immediately removed the models. Engineers framed this as a sovereignty risk: closed APIs can vanish overnight due to geopolitics. Artificial Analysis noted its Intelligence Frontier chart moved backward for the first time. The post does not disclose specific jailbreak details or a restoration timeline.

The US government issued an export control directive banning foreign nationals from accessing Anthropic's Fable 5 and Mythos 5 models. Anthropic took both offline globally. Fable 5 launched just three days ago; Mythos 5 was only available to select partners. The ban covers nationals of close allies including the UK, Canada, Australia, and New Zealand, regardless of where they live. Australian legal AI startup Isaacus used the moment to double down on its self-hosting stance: every model they ship supports air-gapped deployment, and they plan to make future AI applications fully self-hostable too.

Anthropic shut off access to Fable 5 and Mythos 5 on Friday night, just days after launch. The US Commerce Department directed the shutdown, citing national security concerns over a potential Fable 5 jailbreak. The post doesn't disclose the jailbreak details or the directive text, but confirms the models are now offline.

The US government suspended foreign-national access to Fable 5 and Mythos 5 on national security grounds. Anthropic disabled both models immediately; other Claude models are unaffected. Anthropic calls it a misunderstanding and is working to restore access. DAIR.AI's Elvis Saravia said he dropped Claude entirely this week and stressed the importance of sovereign AI. The post doesn't disclose the specific export control clause or a timeline for restoration.

Anthropic says the US government issued an emergency export control directive, forcing a global shutdown of Fable 5 and Mythos 5 APIs. The trigger was a narrow jailbreak that asked the model to fix vulnerabilities in a specific codebase. Anthropic is pushing back, but access is already cut. The post doesn't disclose model size; one commenter estimates 10 trillion parameters. This is a live demo of centralized API risk: a single government decree can kill access for hundreds of millions of users overnight.

Anthropic posted a statement that the US government directed them to suspend access to Fable 5 and Mythos 5, covering both inside and outside the US, including foreign national employees. The post doesn't disclose the specific reason or directive details, only a link to the statement. Reddit comments compare it to ITAR-level export controls and note the irony given Anthropic's past calls for heavy regulation.

Anthropic stated the US government issued an export control directive on June 12 at 5:21 pm ET, ordering suspension of all access to Fable 5 and Mythos 5 by any foreign national, including foreign Anthropic employees. To comply, the company shut down both models for all users; other models are unaffected. The government cited a jailbreak method that bypasses Fable 5's safeguards, but Anthropic reviewed the demo and says it only exploited a few known minor vulnerabilities via a narrow, non-universal jailbreak—capabilities also available in other public models like GPT-5.5. Anthropic argues its safeguards are the strongest yet deployed, perfect jailbreak resistance doesn't exist in the industry, and its defense-in-depth strategy plus monitoring is the right approach. The company is complying but disagrees that a narrow jailbreak justifies recalling a model already deployed to hundreds of millions of users.

On June 11, the US government issued an export control directive suspending all foreign national access to Anthropic's Fable 5 and Mythos 5, including foreign employees. Anthropic shut down both models entirely. The control target expanded from chips and model weights to online API calls. The government disclosed no technical evidence; Anthropic said the jailbreak demo it saw didn't warrant a full access cutoff. Access surface now becomes a fifth dimension of frontier model capability, and compliance may become a heavier competitive moat than model performance.