This heralds the end of frontier model development in the US since the same national security argument can and will be made against any model stronger than Fable/Mythos. Squashing the ability of Anthropic and OpenAI to deploy newer stronger models will destroy their valuation so no trillion dollar IPOs either. Low cost Chinese models will soon catch up to Opus and GPT-5.5 eroding Anthropic and OpenAI's ability to charge more. The knock on effects of this are just beginning.