Businesses are now spending more on Anthropic than OpenAI for the first time, according to a key measure. Ramp's AI Index shows Anthropic at 34.4% business adoption vs OpenAI’s 32.3%, marking a dramatic shift in enterprise AI market dominance.
Anthropic has crossed a symbolic threshold in the AI race: businesses are now spending more on Anthropic than OpenAI for the first time, according to one closely watched measure. New data from Ramp's AI Index shows Anthropic reached 34.4% business adoption in April, overtaking OpenAI at 32.3%, a dramatic reversal in a market once dominated by OpenAI.
Ramp helps companies pay their bills and tracks billions of dollars spent on AI services each month through its platform that analyzes corporate card and bill-paying activity from more than 50,000 US businesses. The index doesn't capture all corporate spending on AI but is considered a popular way to track the market's trends.
This milestone marks one of the most significant shifts in the generative AI era. Not so long ago, OpenAI was the clear leader in enterprise AI. In January, Ramp data showed OpenAI far ahead of rivals with adoption surging across software development, research, finance, and customer support. Now, the company that ignited the modern AI boom has been overtaken by its biggest challenger.
Anthropic has steadily gained momentum with corporate customers over the past year. Adoption surged in late 2025 and early 2026 as companies embraced Claude Code for software development. Anthropic is now trying to extend that success into other enterprise workflows, such as legal operations, finance, and research.
However, the victory may prove fragile. Ramp economist Ara Kharazian warned that AI competition remains unusually volatile, with businesses rapidly switching models based on factors including cost, performance, and reliability. Rising token costs, compute shortages, and growing interest in cheaper open-source alternatives could reshape the market again within months.
"We have never seen a software industry as dynamic where newcomers can disrupt market leaders in a matter of months, and where the pace of development overrides the typical forces of vendor stickiness," Kharazian said. "So these results should not be construed to suggest Anthropic is the definitive leader in business adoption."
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