Last month, the Trump administration forced AI company Anthropic to withdraw its most powerful Mythos 5 and Fable 5 AI models, citing “national security” issues. The government had gotten wind that Fable 5’s internal safety guardrails could be circumvented or “jailbroken,” in major vulnerabilities that spooked officials.
Anthropic itself has long warned that its latest models are adept at spotting cybersecurity vulnerabilities that can be exploited by bad actors. Up until the government clamped down, the company had only given a limited number of businesses and institutions access to Mythos 5, the more powerful and less restrained of the two models, to give them a chance to patch up any gaps in security.
Weeks later, the US government once again gave Anthropic green light to resume its limited roll out of Mythos 5. As of July 1, Fable 5 is once again available to the public, but for a steep off-subscription price, and Mythos 5 is available to around 100 US organizations and government agencies.
However, hackers looking to use AI to commit crimes are rapidly getting new options. As Forbes reports, Beijing-based AI company Z.ai has released an open-weight model, dubbed GLM-5.2, that can perform similar large-scale coding tasks and trade blows with Anthropic’s latest models when it comes to identifying vulnerabilities.

