Nothing in the APA prohibits agencies from using computational tools to gather, synthesize, or even recommend policy choices—and agencies already often rely on modeling tools to inform regulatory standards. What the APA requires is that the final rule itself be the product of reasoned judgment—supported by evidence, responsive to significant comments, and explained in a coherent manner. If those conditions are satisfied on the face of the rule, it is unlikely that a court reviewing a challenge to the rule will examine how AI was used in the decisionmaking process, perhaps absent some external reason to suspect overreliance on AI. If, on the other hand, the rule ignores key evidence, fails to address major concerns or alternatives, or offers inconsistent reasoning, it will be struck down as arbitrary regardless of whether AI was used in its development.