Not much stops them from saying it's due to national security, when it's actually due to the guy in the chair having a fit of emotions. And the current admin has a very long streak of declaring things as national emergencies when those things just so happen to be something they recently lost face on.
> Not much stops them from saying it's due to national security, when it's actually due to the guy in the chair having a fit of emotions
Trying to discern the motive for something like this in a court is a losing game. The opposing side has a good argument ("Anthropic said this is a weapon, so we're controlling it like a weapon") that does not involve first amendment protection.
Anthropic shot themselves in the foot, and they have nobody to blame but themselves.
There are multiple models at the level of or better than Fable / Mythos (see OpenRouter's just released Fusion API) and none of them are getting restricted.