Rivian’s AI-powered voice assistant is rolling out today to the company’s vehicle fleet. The assistant will be available through a software update to all compatible Rivian Gen 1 and Gen 2 vehicle owners who subscribe to the company’s Connect Plus cellular service, which costs $15 a month or $150 a year, or are in an active trial. First announced at last year’s AI and Autonomy Day , the Rivian Assistant is powered by the company’s Rivian Unified Intelligence, “a shared, multi-modal AI foundation” that is “interwoven” throughout the entire company. The assistant is deeply embedded in the vehicle’s operations, but will also pair with third-party apps like Google Calendar. Rivian has said that the assistant is designed in-house, but “augmented” by third-party models “for grounded data, natural conversation and powerful reasoning.” I got to test an early version of the Rivian Assistant last year .…