The corporate credit card statement, once a mundane ledger of travel and office supply purchases, has become an unexpected economic indicator. It now tells a story of a high-stakes technological arms race, revealing not just where companies are spending but on which intelligence they are betting. New data from expense management platform Ramp provides a rare, unfiltered glimpse into this battle, showing that while Anthropic still holds a lead among U.S. businesses, OpenAI is closing the gap in a market that remains fiercely volatile.
Ramp, which processes billions in spend for over 70,000 American businesses, reports that as of July, Anthropic commanded nearly 44% of the paid AI market share among its users. OpenAI held nearly 40%. This snapshot is significant because it marks a reversal from May when Anthropic first overtook OpenAI 41% to 39% and the ChatGPT maker has been playing catch-up ever since. The data’s provenance is crucial. Ramp’s client base, while diverse, has a pronounced tilt toward the tech sector, making it a leading indicator for early-adopter sentiment. This isn’t the total enterprise market—it excludes massive corporations using American Express’s systems—but it is a real-time pulse check on the segment that often dictates future trends.
The more intriguing trend, however, lies in the velocity. According to Ramp economist Ara Kharazian, OpenAI’s growth rate among this business cohort in the third quarter to date has surpassed Anthropic’s. In a field where a single model release can reshape the landscape in weeks, this momentum matters. As Kharazian noted on social media, the recent launch of “GPT-5.6 Sol” has resonated with developers, while Anthropic’s high-end “Fable 5” model faced headwinds due to its price and stringent data retention policies mandated by regulators. This is a classic competitive dynamic: one player accelerates on product performance, the other stumbles on compliance and cost.
Yet, interpreting this requires nuance. Fable is not a direct ChatGPT competitor; it’s a specialized, enterprise-grade tool built for complex, sensitive tasks. Its $40-per-month price tag and 30-day data retention rule, while controversial, reflect its design for a different tier of user. The backlash, however, underscores a fragile reality in enterprise AI: trust is as critical as capability. A company’s willingness to entrust its proprietary data to a third-party model is a profound decision, easily rescinded. The Ramp data vividly illustrates this fickleness—businesses are “flopping back and forth” with each new model release. This volatility should give investors in both OpenAI and Anthropic serious pause. It challenges the narrative of “sticky” enterprise software revenue and suggests that in AI, customer loyalty is perpetually up for grabs.
Beneath this market share tussle lies a more reassuring trend for the sector overall: the market itself is expanding rapidly. The percentage of Ramp’s business customers paying for any AI service has climbed steadily, surpassing 50% in March and reaching nearly 56% by July. This is the core bullish signal. The pie is growing so quickly that even as they duel for slices, both companies’ absolute revenues are likely increasing. It’s a reminder that we are still in the land-grab phase, where ecosystem growth can mask underlying customer churn.
From my vantage point in the Financial District, this data reads like a quarterly earnings call for an industry that hasn’t yet gone public. It reveals a market in furious flux, where technological advantage is temporary and commercial success is not guaranteed by a research breakthrough. The real takeaway for observers and investors is not that OpenAI is gaining, but that no lead is safe. The ultimate winner may not be the lab with the most impressive benchmark scores but the one that best masters the unglamorous fundamentals of business: consistent execution, predictable pricing, and ironclad data stewardship. The race is far from over; the corporate card receipts are just telling us who’s making a move on this lap.
- Corporate credit cards as economic indicators
- Ramp’s market share insights
- Competitive dynamics between Anthropic and OpenAI
- Importance of trust in enterprise AI
- Market growth in AI services
- The volatility of customer loyalty
| Company | Market Share (July) | Market Share (May) |
|---|---|---|
| Anthropic | 44% | 41% |
| OpenAI | 40% | 39% |
