For the price of one minute of Christopher Nolan's Odyssey, you could generate 380 episodes of Grok's AI version. And I stacked the math against the AI to get there. Nolan's movie cost about $250 million and runs 172 minutes. That works out to roughly $1.45 million for every minute you sit and watch. Grok Imagine charges 25 cents a second for its best quality video, so call it $15 a minute. Comparing those two straight up wouldn't be fair, though, because Nolan didn't use most of what he…