US Government Reportedly Shuts Down Fable 5, Mythos 5 AI Models
A Reddit user claims the US government directed Anthropic to globally shut down its frontier AI models, Fable 5 and Mythos 5, citing a 'jailbreak' that enabled finding software vulnerabilities. Anthropic reportedly stated the jailbreak was limited and similar to capabilities in models like GPT-5.5. The incident has raised discussions regarding AI access and control, particularly after Fable 5's prior use of unannounced safety layers for sensitive topics.
A Reddit user reported the global shutdown of two frontier artificial intelligence models, Fable 5 and Mythos 5, alleging that the US government instructed their developer, Anthropic, to cease access. The reported reason for this action was a 'jailbreak' that purportedly allowed the models to assist in identifying software vulnerabilities.
According to the Reddit post, Anthropic has publicly stated that this particular jailbreak was 'super limited.' The company reportedly noted that other models, such as GPT-5.5, possess similar capabilities.
Prior to the alleged shutdown, Fable 5 reportedly included 'invisible safety layers' designed to switch users to a less capable model without explanation if queries pertained to cybersecurity, AI research, or bio-related topics. Anthropic is said to have later acknowledged that this design choice was a 'wrong call.'
Separately, the Reddit user mentioned that an unnamed major US tech company implemented an overnight ban on all AI tools, citing concerns related to data retention windows and national security.
(Source: Reddit r/Futurology)
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