Claude Becomes The Enterprise Favorite As Anthropic Passes OpenAI

InnovationAIClaude Becomes The Enterprise Favorite As Anthropic Passes OpenAIBySandy Carter,Contributor.Forbes contributors publish independent expert analyses and insights. Sandy Carter, COO at Unstoppable, Top 10 Microsoft MSN AI EntrepreneurFollow AuthorJun 05, 2026, 12:46pm EDTAnthropic's Claude bypasses OpenAI in adoption.AnthropicWhen a new workload lands on a team’s desk, one question now decides the next year of spend: do you reach for Anthropic’s Claude first?For the first time since the AI race began, more US businesses answer yes.The May 2026 Ramp AI Index, drawn from corporate card and invoice data across more than 50,000 US companies, 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 its share by 0.3%.That is a stunning reversal in a category OpenAI has led since ChatGPT launched.Anthropic just passed OpenAI in business adoption for the first time.Sandy Carter Plotting Ramp DataWhy Anthropic’s Claude And OpenAI’s ChatGPT Land In The Same BudgetsBefore anyone declares a winner between Claude and ChatGPT, look closely at the math, because it tells a richer story than the headline.Overall business AI adoption sits at 50.6%. Add the two vendor shares together and you land far past that total, which is only possible when a large slice of companies pay for both. The floor works out to roughly 16% of all businesses, about a third of every company using AI at all, writing checks to Anthropic and OpenAI at the same time. Enterprises are running multi-model stacks, and the Ramp data proves it.MORE FOR YOUSo adoption here measures something specific: which model teams reach for first when a fresh project starts. That is why the crossover matters. Anthropic became the default for the next build, especially in coding, even inside companies that still run OpenAI elsewhere. With many new AI roles popping up from the new coding trend, this momentum is likely to...