The US government blocked access to Anthropic's Fable 5 and Mythos 5 models, citing national security concerns, after a research paper claimed the models could be used to bypass security guardrails. However, a researcher who read the paper claims the 'jailbreak' was actually just a simple prompt to 'fix this code'. The researcher argues that this capability is essential for defensive cybersecurity and that removing it would make the models less useful for finding and fixing bugs. The incident has sparked debate about the balance between security and the potential benefits of AI models like Fable 5.