OpenAI Gains Ground on Anthropic Among Business Users, Ramp Data Shows
OpenAI is closing the gap with Anthropic among US business users, according to spending data from Ramp released on August 20, 2026. The corporate card and expense management company reports that OpenAI's market share among its paying business customers has been climbing in Q3 2026 after Anthropic pulled ahead earlier in the year.
Anthropic first surpassed OpenAI in market share among Ramp's paying business users in May 2026, reaching 41% versus OpenAI's 39%. By July 2026, Anthropic held nearly 44% compared to OpenAI's nearly 40%. But Ramp economist Ara Kharazian states that OpenAI is currently growing faster than Anthropic among Ramp's business customers in Q3 2026 to date. TechCrunch
Ramp's data covers more than 70,000 American businesses using its bill pay and corporate card products. The company declined to provide actual dollar spending figures, sharing only market share percentages. Ramp's customers skew toward the tech industry, as the card is popular among Silicon Valley companies, and the data excludes large enterprises that use spend-management tools from providers like American Express rather than Ramp.
The competitive dynamics between the two companies have shifted significantly over the past year. In April 2025, OpenAI commanded roughly 32% of business AI adoption on Ramp's platform while Anthropic stood at under 8%, according to Ramp's underlying data. VentureBeat Menlo Ventures separately reported that Anthropic tripled its enterprise market share to 40%, up from 12% in 2023, while OpenAI fell from 50% to 27% and Google reached 21%. LinkedIn/Menlo Ventures
Kharazian posted on X that OpenAI's GPT-5.6 Sol is increasingly the choice for developers, while Anthropic's Fable 5 disappointed in adoption and real-world application due to price and data retention requirements imposed by regulators. Anthropic warned Fable users that it must retain their data for 30 days.
The overall market is expanding alongside these share shifts. The percentage of Ramp customers that pay for AI topped 50% in March 2026 and reached nearly 56% by July 2026. Enterprise customers account for roughly 40% of OpenAI's business and 80% of Anthropic's business, according to executives. CNBC
Anthropic's annual revenue run rate (a measure of annualized recurring revenue based on current monthly performance) topped $65 billion by the end of July 2026, up from about $47 billion at the end of 2025. Reuters OpenAI claims its enterprise product has more than 5 million business users and counts SoftBank, Target, and Lowe's as customers. TechCrunch
The broader context here is that market share data drawn from a single spend-management platform can only reveal so much. Ramp's sample over-indexes toward smaller, tech-forward companies and excludes the Fortune 500 tier that routes expense through American Express or other incumbents. The percentages describe relative momentum within that cohort, not the total enterprise AI market. Still, spend data offers a harder signal than self-reported usage surveys, because it reflects actual money committed month over month.
Kharazian's commentary on X introduces a second layer worth examining. If GPT-5.6 Sol is pulling developer mindshare while Fable 5 struggles with price sensitivity and a mandatory 30-day data retention window, the swing factors are concrete and product-level rather than brand-driven. A 30-day retention requirement, imposed by regulators and disclosed to users, is the kind of compliance friction that enterprise procurement teams weigh heavily, particularly in regulated industries. That a model's regulatory posture can materially affect its adoption velocity is a signal the market is maturing past pure capability comparisons into procurement-grade evaluation.
Anthropic's heavy enterprise concentration, with 80% of its business coming from enterprise customers versus OpenAI's 40%, cuts both ways. It means Anthropic has captured high-value accounts, but it also means its revenue is more exposed to the kind of contract-level churn that a single compliance or pricing misstep can trigger. OpenAI's more diversified base across consumer and enterprise segments may give it more runway to iterate on enterprise positioning without the same concentration risk.
The geographic picture is also evolving. According to Anthropic's own Economic Index report, the share of per-person usage going to the top five US states decreased from 30% to 24% between August 2025 and February 2026, suggesting AI adoption is diffusing beyond its early coastal concentrations. Anthropic
What the Ramp data ultimately captures is a market that is simultaneously expanding and reshuffling. More than half of Ramp's business customers now pay for AI. The question of which provider leads on any given platform in any given month is becoming less a story of winner-take-all and more a reflection of which vendor shipped the better model, at the better price point, with the more palatable data terms in that particular quarter.
