The Trump administration has lifted previous restrictions on Anthropic’s latest AI models, Claude Fable 5 and Mythos 5, following a period of heightened cybersecurity concerns. This decision ends a temporary ban that had been in place for several weeks, affecting access to these advanced AI systems.
Resumption of AI Model Availability
Late Tuesday, Anthropic announced that its Claude Fable 5 AI model is now accessible to a broad audience once again. Meanwhile, the more sophisticated Mythos 5 model is being made available only to a limited group of U.S.-based organizations that have received federal approval. This selective access underscores the ongoing caution around potential security risks associated with advanced AI technologies.
Initial Restrictions and Their Impact
On June 12, the U.S. Commerce Department imposed restrictions on foreign nationals using Anthropic’s AI models. San Francisco-based Anthropic had to quickly cease offering these products, just days after their initial release. The abrupt halt was attributed to a report by cybersecurity researchers at Amazon, Anthropic’s main cloud computing partner, who identified a method to bypass Fable 5’s safety protocols, potentially exposing software vulnerabilities.
Rival Responses and Government Oversight
Concerns about AI security have been growing, especially after Anthropic highlighted earlier this year that the Mythos model could identify software flaws that might be exploited by cybercriminals. In response to similar pressures, Anthropic’s competitor, OpenAI, announced on Friday that it would limit access to its new AI model, GPT-5.6 Sol, to a select group of government-approved users temporarily.
In a related move, President Donald Trump signed an executive order establishing a framework for federal oversight of AI systems, which includes a 30-day security review period prior to public release. While participation by AI developers is currently voluntary, the framework aims to address national security risks posed by cutting-edge AI technologies.
The ongoing developments in AI oversight and security measures highlight the delicate balance between innovation and safety, as governments and companies navigate the challenges posed by rapidly advancing technologies.
