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    • Ramp Data Shows Anthropic Surpassing OpenAI in Business Adoption

    By Any May 21, 2026
    According to the AI Index from fintech firm Ramp, Anthropic surpassed OpenAI in business customer adoption for the first time in April. The data shows 34.4% of Ramp's business clients paid for Anthropic services, compared to 32.3% for OpenAI.
    Ramp Data Shows Anthropic Surpassing OpenAI in Business Adoption

    Ramp Data Shows Anthropic Surpassing OpenAI in Business Adoption Anthropic has quietly edged past OpenAI in one of the most closely watched battlegrounds in artificial intelligence: paid enterprise adoption, according to new data from fintech firm Ramp.

    Early lead and a dramatic reversal

    At the start of 2025, Ramp’s AI Index showed OpenAI as the clear enterprise leader, with adoption surging across software development, research, finance, and customer support. By May 2025, only about 9% of businesses using Ramp were paying for Anthropic’s products, leaving OpenAI firmly in front.

    Over the following 12 months, those dynamics flipped. Anthropic’s share among Ramp clients climbed 26 percentage points to reach 34.4%, while OpenAI’s slipped by about 1%. In April 2026, Ramp’s latest index showed that 34.4% of participating businesses were paying for Anthropic services, compared with 32.3% for OpenAI — the first time Anthropic has held the top position on this measure.

    Why Anthropic pulled ahead

    Ramp economist Ara Kharazian said Anthropic had already been leading in high-adoption sectors like finance, tech and professional services, and then broadened out from a “very technical customer base” through tools such as its Cowork product. Business Insider reports that late 2025 and early 2026 saw a surge as companies embraced Claude Code for software development, helping Anthropic cross a “symbolic threshold” where businesses now spend more on it than on OpenAI, at least within Ramp’s sample of more than 50,000 U.S. firms.

    Skepticism, volatility and OpenAI’s countercase

    Despite calling the shift “a stunning reversal in the competitive market dynamics for AI model providers,” Kharazian remains bearish on Anthropic’s longer-term edge, arguing that its revenue model incentivizes pushing customers toward more expensive models even when cheaper ones might suffice. He also notes AI competition is unusually volatile, with enterprises rapidly switching providers as costs, performance and reliability change.

    OpenAI, meanwhile, stresses that Ramp tracks card and bill-pay activity rather than its large contract deals, saying it is “driving enterprise transformation at scale” through engagements that don’t show up as simple card transactions. The company remains a dominant consumer brand and expects to generate more revenue than Anthropic this year, Axios reports.

    Broader industry currents

    The Ramp data aligns with other signals that Anthropic’s momentum has been building. On OpenRouter’s leaderboard, OpenAI last ranked above Anthropic in December 2025, suggesting a broader usage trend beyond Ramp’s client base.

    The competitive landscape is also being shaped by expectations around openness and ecosystem building. Hugging Face CEO Clément Delangue publicly wondered whether the arrival of AI researcher Andrej Karpathy at Anthropic could mean “more open-source” from the company, noting it is “already contributing datasets” but that “more” could have “massive potential for impact.”

    As both Anthropic and OpenAI race toward potential blockbuster IPOs, April’s numbers underscore how quickly the balance of power in enterprise AI can shift — and how far from settled the market remains.

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