NSA lost access to Anthropic's Mythos model after export controls

NSA lost access to Mythos amid Anthropic dispute

NSA cybersecurity analysts had been testing Anthropic's Mythos model and found it could break into nearly all of their classified systems within hours. After the Trump administration imposed export controls on Anthropic this month, Mythos 5 and Fable 5 were pulled back, cutting off NSA's access. Senator Mark Warner cited NSA chief Gen. Joshua Rudd at a hearing, saying Mythos breached classified networks 'not in weeks, but in hours.' The article doesn't say whether NSA has a backup plan or what specifically triggered the export controls.

Why it matters: NYT exclusive with NSA test results and Senate hearing details. The 'hours not weeks' breach claim is hard new info, and the export-control cutoff adds policy tension. Downside: the article doesn't specify which systems were breached or how, so the technical picture is still c...