Claude Becomes The Enterprise Favorite As Anthropic Passes OpenAI

The May 2026 Ramp AI Index shows Anthropic at 34.4% of business adoption, ahead of OpenAI at 32.3%. Anthropic quadrupled its business adoption over the past year while OpenAI grew by 0.3%. Overall business AI adoption sits at 50.6%, with roughly 16% of companies paying for both vendors. Enterprises run multi-model stacks, and the crossover means Claude became the default for new projects, especially in coding.