Ramp data: OpenAI is closing the gap with Anthropic among US businesses

Ramp, the corporate credit card and expense management company, published new data showing OpenAI has started gaining ground on Anthropic with US businesses. Until both companies get close enough to their planned IPOs to release their financials, reports like this are among the few windows into how the two businesses are actually doing.

The lead changes hands

OpenAI was once the runaway leader with businesses, and it lost that lead among Ramp's paying business users in May. Anthropic hit 41% market share at the time, against 39% for OpenAI, and the ChatGPT maker has not regained the lead since. As of July, Anthropic stood at nearly 44% and OpenAI at nearly 40%.

The dataset covers more than 70,000 American businesses that spend billions through Ramp's bill pay and corporate card products. Ramp's customers span industries, but as a corporate card popular in Silicon Valley the base skews toward tech. Ramp also declined to share the actual dollars spent, publishing only percentages.

Two caveats keep this from being a market census. One month remains in the quarter, so the trend could easily shift again before it ends. And the data excludes large enterprises that manage their spend through providers like American Express rather than Ramp. What it does show is market direction.

The reading from Ramp's economist

According to Ramp economist Ara Kharazian, the most recent data shows OpenAI is currently growing faster than Anthropic in this segment in Q3 to date. In a post on X, he wrote that "GPT-5.6 Sol is really good, increasingly the choice for developers." On the other side, he continued, "Fable 5, meanwhile, disappointed both in adoption and real-world application given price + data retention requirements imposed by regulators."

That framing may be an oversimplification. Fable, Anthropic's higher-end model tier, is expensive, but it is built for a more targeted set of use cases than a general chatbot. Anthropic also drew some backlash when it warned Fable users that it must retain their data for 30 days, so the complaints about price and retention have a factual anchor.

The market underneath is still growing

Ramp's data also suggests both companies should be growing business revenue while they fight over share, because the overall market is expanding. The percentage of Ramp customers that pay for AI has been climbing steadily. It topped 50% in March and reached nearly 56% by July.

The volatility matters to investors on both sides. Businesses are willing to flip back and forth between the two labs as each releases new models, and that puts a question mark on how "sticky" enterprise AI spending really is.