Anthropic Disables Fable 5 and Mythos 5 After US Export Restrictions
June 2026 | By Azad News
AI company Anthropic announced that it will abruptly disable its most advanced AI models, Fable 5 and Mythos 5, after receiving a US government order restricting access for foreign nationals over national security concerns.
According to the company, the export control directive requires the suspension of access to both models for all foreign users. Anthropic said it was not provided with detailed evidence explaining the specific national security risks behind the decision.
The company stated that US authorities believe a potential method exists to bypass, or "jailbreak", safeguards designed to prevent Fable 5 from being used to identify software vulnerabilities and conduct malicious cyber activities.
Anthropic disagreed with the government's assessment, arguing that the reported vulnerability was narrow and non-universal. The company said recalling a commercial AI model used by millions of people based on such concerns was not justified.
The directive comes amid a complicated relationship between Anthropic and the US government. Earlier this year, the company reportedly refused to allow its AI technology to be used for domestic surveillance and fully autonomous weapons systems, leading to tensions with federal authorities.
The latest action marks a significant escalation in US efforts to limit foreign access to advanced artificial intelligence technologies. Traditionally, export controls have focused on restricting semiconductor chips and hardware rather than direct access to AI models.
Anthropic recently introduced Claude Fable 5, part of a new category it calls "Mythos-class" AI models. The company implemented safeguards preventing their use in high-risk areas such as cybersecurity, though some users criticised these restrictions as overly broad.
Security experts have warned that highly capable AI systems could accelerate sophisticated cyberattacks if misused, particularly in sectors such as banking and critical infrastructure that rely on complex and legacy technology systems.
Anthropic said the government order forces it to disable Fable 5 and Mythos 5 immediately to ensure compliance, while access to its other AI models will remain unaffected.
The company also said it believes there may be a misunderstanding regarding the security concerns and is working with authorities to restore access to the models as quickly as possible.
The move comes shortly after Anthropic confidentially filed for a US initial public offering (IPO), positioning itself among the leading companies in the rapidly expanding AI industry.
Meanwhile, industry observers warned that if similar standards are applied across the sector, future deployments of frontier AI models by major developers could face significant delays and tighter regulatory scrutiny.
Conclusion
The US government's order to restrict access to Anthropic's Fable 5 and Mythos 5 models highlights the growing debate over AI safety, national security and global access to advanced technologies. The outcome of this dispute could shape future regulations governing the development and distribution of powerful AI systems worldwide.
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