Artificial intelligence company Anthropic has restored public access to its flagship AI models, Claude Fable 5 and Mythos 5, after the US government lifted export restrictions imposed earlier this month over cybersecurity concerns.
The models had been unavailable since June 12 after US authorities introduced emergency export controls following reports that researchers successfully bypassed Fable 5’s safety protections. The incident raised concerns that advanced AI systems could be exploited to discover software vulnerabilities and support cyberattacks.
We’ve received notice that the Department of Commerce has lifted export controls on Claude Fable 5 and Mythos 5.
We’ll begin restoring access tomorrow, and will share an update soon.
We’re grateful to our users for their patience, and to everyone who worked with us on…
— Anthropic (@AnthropicAI) June 30, 2026
Anthropic confirmed the models are returning with stronger safeguards designed to block more cybersecurity-related requests while maintaining access for legitimate users.
Why did the US restrict Anthropic’s AI models?
The restrictions followed a report showing that researchers found a way to jailbreak Fable 5 shortly after its release. By bypassing the model’s safety measures, they were able to make it identify software vulnerabilities that could potentially be misused.
The US government responded by placing temporary export controls on the models while working with Anthropic to review their security.
Announcing the decision to lift the restrictions, US Commerce Secretary Howard Lutnick said the government had worked closely with Anthropic over the past two weeks to ensure the models met national security expectations while supporting America’s AI leadership.
Anthropic said it has now deployed updated classifiers that better detect and block harmful cybersecurity requests.
What does the decision mean for AI and crypto?
The temporary suspension drew attention across the technology industry, including the crypto sector, where advanced AI tools are increasingly used for blockchain security, smart contract analysis, fraud detection, and developer research.
The incident also showed growing government scrutiny of frontier AI models that could be used to identify vulnerabilities in software, blockchain infrastructure, or digital asset platforms if abused.
Anthropic argued that the reported security issue was not unique to Fable 5, saying less capable AI models could also identify similar vulnerabilities under certain conditions.
Anthropic expands AI security partnership
Alongside the relaunch, Anthropic announced deeper cooperation with the US government on AI safety testing and cybersecurity research.
The company said it is working with Amazon, Microsoft, Google, and other partners through its Project Glasswing initiative to develop a common framework for measuring the severity of AI jailbreaks and improving industry-wide safeguards.
The collaboration will also include pre-release government testing of future AI models, information sharing on jailbreak attempts, and joint research into preventing misuse.
Meanwhile, Anthropic is on the verge of sealing a $1.5 billion joint venture with major financial players, bringing enterprise-grade artificial intelligence into private equity-backed companies.
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