AI is being used in the health, tech, and finance sectors.Andriy Onufriyenko/Getty ImagesMore businesses are upping their bets on AI tools.OpenAI, Midjourney, and more are the top AI companies people are spending money on, Ramp reported.Big Tech is pairing up with increasingly popular services or creating its own AI services.The business of artificial intelligence is booming, and its key players are helping companies grow in all areas.Spend management company Ramp published a Q1 spending report on which AI companies its clients are paying for.