Until both OpenAI and Anthropic release financial information close enough to their planned IPOs, they will have to rely on other sources for signs of how well their businesses are doing. One of those sources, Ramp, a corporate credit card and expense management company, released some surprising new data. That means OpenAI is starting to use Anthropic in US companies.
OpenAI, once the overwhelming leader for both businesses and consumers, lost its lead among Ramp’s paid business users in May. At that time, Anthropic’s market share was 41%, compared to OpenAI’s 39%. The ChatGPT maker was never able to regain that lead. As of July, Anthropic had nearly 44% of the market compared to OpenAI’s nearly 40%.
This data covers more than 70,000 U.S. businesses that spend billions of dollars through Ramp’s bill payment and business card products. Ramp’s customers span a variety of industries, but as Silicon Valley’s favorite business credit card, it skews toward the technology industry.
A closer look at the latest data shows that OpenAI is growing faster than Anthropic in this segment so far in the third quarter, according to Ramp economist Ara Kharazian. Mind you, there’s still one month left in this quarter, which is equivalent to 30 years of AI, so trends could easily change again before this quarter is over. Lamp also declined to provide the actual amount spent, only sharing percentages.
To borrow a bit from ChatGPT’s own hedging style, this is not a measure of the market as a whole. Large companies that use spend management tools from providers like American Express rather than Ramp are excluded. But it’s enough data to give you an indication of the market. And what it shows is that Anthropic has not won permanently. While companies are willing to go back and forth as each lab releases a new model, that volatility should give investors in both companies pause about how “sticky” the companies’ AI spending really is.
“GPT-5.6 Sol is really great and increases the options for developers,” Kharazian wrote on X about OpenAI’s new growth. “Fable 5, on the other hand, was a disappointment in both adoption and real-world applications, given the price and data retention requirements imposed by regulators,” he continued.
That may be an oversimplification. Anthropic’s higher-end model tier, Fable, is more expensive but built for a more targeted set of use cases than general chatbots. Still, Anthropic sparked some outrage when it warned Fable users that their data must be retained for 30 days.
Ramp’s data also suggests that operating revenues should increase, even as the two companies compete for market share, as the overall market is expanding. The proportion of these Ramp customers who pay for AI is steadily increasing. In March, it exceeded 50%. By July, that percentage had reached nearly 56%.
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