OpenAI Gains Ground on Anthropic Among U.S. Business AI Users

OpenAI is showing renewed momentum among U.S. businesses, even as Anthropic remains the most widely adopted AI provider among companies tracked by corporate spending platform Ramp.

Ramp’s July data showed 43.5% of businesses paying for Anthropic products, up 1.1 percentage points from June. OpenAI reached 39.7%, an increase of just 0.23 percentage points. Anthropic first surpassed OpenAI in Ramp’s business adoption data earlier this year.

OpenAI is growing faster so far in the third quarter

The latest quarter-to-date figures suggest the competition may be shifting again. Ramp lead economist Ara Kharazian said OpenAI has surpassed Anthropic in quarter-over-quarter enterprise growth so far in the third quarter, with Ramp’s measure showing 82 for OpenAI compared with 76 for Anthropic.

Kharazian pointed to GPT-5.6 Sol as one factor behind OpenAI’s recent momentum, particularly among developers. Ramp’s separate analysis found that GPT-5.6 Sol accounted for 25% of OpenAI tokens purchased by businesses in July and 23% of model-attributed spending.

Anthropic’s premium Fable 5 model saw more limited adoption during its first month. Ramp reported that Fable 5 represented 6% of tokens purchased from Anthropic and 11.4% of spending on its models. In July, Ramp estimated that Fable 5 generated about three-quarters as much model-attributed spending as GPT-5.6 Sol.

Ramp data offers a partial view of the AI market.

The figures are based on spending by more than 70,000 U.S. businesses usingRamp’ss corporate cards and bill-pay products. That provides a sizable view of business AI adoption, but it is not a measurement of the entire enterprise market. Ramp’s customer base also has a significant technology-sector presence, and many large companies use other expense-management providers.

The broader trend remains positive for AI vendors. The share of Ramp businesses paying for AI software reached about 55.7% in July, up from 50.7% in March.

Anthropic therefore remains ahead in overall adoption among Ramp customers, whileOpenAI’ss stronger third-quarter growth shows that the lead is not necessarily permanent. The data also suggests businesses continue to shift spending as new models arrive, keeping competition between the two AI companies fluid.