AI Watch: US blocks global access to Anthropic’s Fable 5, Mythos 5 AI models amid security concerns

The export restrictions stem from concerns that Mythos 5’s cybersecurity capabilities could be unlocked through Fable 5, according to a reported jailbreak finding. Anthropic has challenged the rationale, arguing similar techniques work on competing AI systems without facing comparable controls. The company has disabled both models for all customers while senior executives engage with policymakers in Washington to seek a resolution. Meanwhile, SpaceX debuted on public markets with a record-breaking IPO.