Anthropic leads business AI spending but OpenAI closes gap, Ramp says

Ramp, a corporate card and spend-management company, said on 20 August that Anthropic remains the leading AI provider among US businesses but that OpenAI is narrowing the gap. Ramp said its AI Index, which tracks spending at more than 70,000 US businesses, found Anthropic's share of business customers at nearly 44% in July, against OpenAI's nearly 40%.

Anthropic first overtook OpenAI in May, when it held 41% of businesses to OpenAI's 39%, according to Ramp. Since then, OpenAI's share has been rising again, the data showed.

Ramp said the overall share of its customers paying for AI passed 50% in March and reached almost 56% by July.

Ara Kharazian, an economist at Ramp, said GPT-5.6 Sol has become popular with developers. "GPT-5.6 Sol is really good, increasingly the choice for developers," Kharazian said.

Anthropic's premium model, Fable 5, has captured a smaller share of usage than OpenAI's cheaper GPT-5.6 Sol, according to Ramp's data, which suggests limits on how much companies will pay for small performance gains.

Anthropic reported a $65 billion run rate in July, compared with about $40 billion for OpenAI, according to the notes accompanying Ramp's findings.

The figures point to a close contest between the two companies for enterprise customers, with price-performance shaping which models businesses choose. Further monthly data from Ramp will show whether OpenAI's gains continue.

OpenAI is gaining on Anthropic with business users, new data indicates