Why did the US government ban Claude Fable 5?

The US government has issued an export control directive banning foreign nationals from accessing Anthropic's Fable 5 and Mythos 5 AI models, citing unspecified national security concerns. This action was reportedly triggered by security concerns raised by Amazon, a major partner in Anthropic's Project Glasswing initiative. Amazon, after testing Fable 5, discovered vulnerabilities related to 'jailbreaking' the model, which could expose its advanced cyber capabilities for malicious use. While Anthropic initially defended its decision to release Fable 5, stating the jailbreak wasn't serious, the US government appears to have disagreed, leading to the export control. The ban affects all foreign nationals, including foreign Anthropic employees, but US citizens are still able to access the models. This situation highlights the ongoing tension between AI development and national security, with concerns about the potential misuse of powerful AI capabilities.