A.I. chatbots are not just a propaganda tool for violent extremists but are aiding in bomb construction and attack planning, new research finds.

A recent episode underscored the Trump administration’s increasing reliance on advanced A.I. systems for cybersecurity even as it battles a leading U.S. developer.

Workers at the artificial intelligence company have been puzzled and increasingly concerned by the administration’s move to limit their latest A.I. models.

The administration’s surprise restrictions Friday cut off foreign access to Anthropic’s latest models and sparked another round of finger pointing.

The company said on Friday night that the federal government had ordered limits on its Mythos and Fable 5 A.I. systems, citing national security concerns.