The Fluidity of Enterprise AI Adoption

Recent data from corporate expense management platform Ramp—covering over 70,000 U.S. businesses—indicates that the enterprise AI market is characterized by high volatility rather than long-term vendor lock-in. While Anthropic held a lead over OpenAI in business market share starting in May 2026 (41% vs. 39%), the gap has shifted, with Anthropic reaching 44% and OpenAI at 40% as of July. Despite this, OpenAI has shown faster growth in Q3, suggesting that businesses are willing to pivot their spending rapidly as new models are released.

Drivers of Market Shifts

Market share fluctuations appear to be driven by specific product performance and regulatory friction:

• Model Performance: OpenAI’s "GPT-5.6 Sol" has gained traction among developers, contributing to their recent growth.
• Privacy and Cost Friction: Anthropic’s "Fable 5" model has faced headwinds due to its high price point and mandatory 30-day data retention policies, which have caused friction with users concerned about privacy.

Market Expansion vs. Vendor Competition

While the competition between OpenAI and Anthropic is intense, the overall market for paid AI tools is expanding. The percentage of businesses paying for AI services among Ramp’s customer base grew from under 50% in March to nearly 56% by July. This suggests that both companies are benefiting from a rising tide of enterprise adoption, even as they compete for individual account dominance. The lack of "stickiness" in these relationships serves as a warning to investors that enterprise AI spending remains highly sensitive to the latest model capabilities and compliance requirements.