Most AI adoption data comes from surveys. Companies ask business owners what tools they're using, and business owners tell them. The problem with surveys is that people say things that don't match what they actually spend money on.

Ramp does something different. Ramp is a corporate card and bill pay platform used by more than 50,000 American businesses. When those businesses pay for AI services - any AI services - Ramp sees the transaction. Every month, Ramp publishes the Ramp AI Index, which tracks actual spending behavior rather than stated behavior.

The March 2026 update is the most significant data release since the index launched. And if you've been thinking about which AI tools to commit to for your business, the numbers are worth understanding.

The Top Line: Nearly Half of All Businesses Are Now Paying for AI

Overall business AI adoption reached 47.6% of businesses in February 2026. That is a record high, and it represents something of an inflection point: less than two years ago, fewer than one in five businesses was paying for AI services. Now it's approaching one in two.

That number includes businesses of every size, from solo operators running a side business on a Ramp card to mid-market companies with hundreds of employees. The trend across all segments is the same: up.

For the businesses that are not yet paying for AI tools, this data has a practical implication. If nearly half your competitors are using AI and you're not, the productivity and cost gap between you and them is growing every month. That gap is not theoretical anymore. It is showing up in real output differences.

The Big Shift: Anthropic Is Winning New Customers

Here's the number that surprised most people in the business technology community when Ramp published this in March: Anthropic now wins approximately 70% of head-to-head matchups against OpenAI among businesses purchasing AI services for the first time.

Read that again. Of all the businesses that are just now choosing their first AI vendor, seven in ten are choosing Anthropic over OpenAI.

A year ago, this was reversed. OpenAI had the consumer momentum. ChatGPT was where most business owners first encountered AI. That familiarity translated into business adoption. OpenAI was the default.

Something changed.

By the Numbers: The Vendor Shift

• Anthropic adoption: 24.4% of businesses on Ramp, up 4.9% month over month. That is its largest single-month gain since tracking began. A year ago, one in 25 businesses on Ramp was paying for Anthropic. Today it's nearly one in four.

• OpenAI adoption: Still the most widely used AI vendor overall, but its adoption rate fell 1.5% in February 2026. That is the largest single-month decline any AI model company has recorded since Ramp began tracking.

• Google (Gemini): Grew slightly to 4.7%. Benefiting from its Workspace bundle strategy, where Gemini often comes included with tools businesses already pay for.

• xAI (Grok): Holding at less than 2% of businesses.

Why Does This Matter for Your Business Decision?

If you're deciding which AI tools to use - or which to add - this data is useful context, but with a specific interpretation.

Ramp's economist Ara Kharazian, who publishes the index, offers one framing worth knowing: each major AI company has a different distributional advantage. Google wins on bundling - Gemini is included with Google Workspace, so businesses already paying for Workspace get it essentially for free. OpenAI won on consumer familiarity - ChatGPT was where most people first experienced AI, and that carried into business use. Anthropic built its early following among engineers and technical users, and is now leveraging that expert endorsement to move into broader business adoption.

What this means practically: the best AI tool for your business is probably not whichever one is growing fastest right now. It's the one that fits your specific use case. Customer service and writing workflows have different requirements than coding or data analysis.

The shift in vendor market share tells you that businesses are now experienced enough with AI to have real preferences. That's different from a year ago, when most businesses were still in trial mode.

The Other Number That Matters: 68%

Separately from the Ramp data, a QuickBooks survey released earlier this year found that 68% of U.S. small businesses now regularly use AI tools - up from 48% in mid-2024. That's a 20-percentage-point jump in roughly 18 months.

The gap between businesses that are using AI and those that aren't is no longer an early adopter gap. It's a mainstream adoption pattern. The businesses not yet using AI tools are now the minority.

The practical question is not whether to use AI tools. It's which ones, for what, and at what cost. The Ramp data is one signal. The QuickBooks data is another. Together they paint a picture of a small business market that has largely committed to AI - and is now sorting out which vendors to trust with that commitment.

Priya Kapoor covers money and data for The Useful Daily. Sources: Ramp AI Index March 2026, Ramp AI Index data page, Ramp Winter 2026 Spending Report