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Anthropic discloses a US export-control directive affecting Fable 5 and Mythos 5
Anthropic has disclosed a US government export-control directive, citing national-security authorities, that suspends access to its Fable 5 and Mythos 5 models for any foreign national, whether inside or outside the United States, including foreign-national Anthropic employees. To comply, Anthropic said it had to abruptly disable both models for all customers as of the evening of 12 June; access to all other Anthropic models remains unaffected.
What changed
In its statement, Anthropic said the directive did not specify the national-security concern, but that its understanding is the government believes it has found a method of "jailbreaking" Fable 5. Anthropic reviewed a demonstration and said the technique surfaced a small number of previously known, minor vulnerabilities that other publicly available models, including OpenAI's GPT-5.5, can also find without a bypass. The company said no universal jailbreak has been found, that it had red-teamed Fable's safeguards for thousands of hours with the US government, the UK AISI, and third parties before launch, and that it adopted a "defence in depth" strategy backed by 30-day data retention to detect and shut down attacks.
Anthropic said it is complying with the legal directive while disagreeing that a narrow potential jailbreak should justify recalling a commercial model used by hundreds of millions, arguing the same standard would halt new model deployments across the industry. It called the action a likely misunderstanding and said it is working to restore access, while reiterating its view that governments should be able to block unsafe deployments through a transparent, fact-based statutory process.
Why it matters for advertisers
For you, this means teams relying on these specific frontier models should expect disruption and have a fallback plan, while most Anthropic usage remains unaffected. Worth confirming which models your workflows depend on, so a sudden access change does not stall delivery.
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Anthropic discloses a US export-control directive affecting Fable 5 and Mythos 5
Anthropic has disclosed a US government export-control directive, citing national-security authorities, that suspends access to its Fable 5 and Mythos 5 models for any foreign national, whether inside or outside the United States, including foreign-national Anthropic employees. To comply, Anthropic said it had to abruptly disable both models for all customers as of the evening of 12 June; access to all other Anthropic models remains unaffected.
In its statement, Anthropic said the directive did not specify the national-security concern, but that its understanding is the government believes it has found a method of "jailbreaking" Fable 5. Anthropic reviewed a demonstration and said the technique surfaced a small number of previously known, minor vulnerabilities that other publicly available models, including OpenAI's GPT-5.5, can also find without a bypass. The company said no universal jailbreak has been found, that it had red-teamed Fable's safeguards for thousands of hours with the US government, the UK AISI, and third parties before launch, and that it adopted a "defence in depth" strategy backed by 30-day data retention to detect and shut down attacks.
Anthropic said it is complying with the legal directive while disagreeing that a narrow potential jailbreak should justify recalling a commercial model used by hundreds of millions, arguing the same standard would halt new model deployments across the industry. It called the action a likely misunderstanding and said it is working to restore access, while reiterating its view that governments should be able to block unsafe deployments through a transparent, fact-based statutory process.
For you, this means teams relying on these specific frontier models should expect disruption and have a fallback plan, while most Anthropic usage remains unaffected. Worth confirming which models your workflows depend on, so a sudden access change does not stall delivery.
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