Two months ago, OpenAI led Anthropic by 11 percentage points in business adoption. That gap is now 4.6 points, and closing. That is the finding from the Ramp AI Index for April 2026, which tracks which AI vendors are being paid by businesses on Ramp's corporate card platform.
Anthropic grew from 24.4% to 30.6% business adoption over the past two months, a gain of 6.3 percentage points. OpenAI now sits at 35.2%. If Anthropic maintains anything close to its recent rate of growth, it would pass OpenAI within two months.
Whether that happens matters beyond competitive scorekeeping. OpenAI built much of its enterprise strategy around brand recognition from consumers, using ChatGPT's cultural ubiquity to win IT procurement decisions. Anthropic came from the opposite direction: fewer casual users, more direct API sales to developers and companies. The Ramp data suggests that approach has been working.
The timing is notable. Claude 3.5 Sonnet and Claude 3.7 Opus both received strong reviews for coding and reasoning tasks over the past quarter, and Anthropic's enterprise contracts have grown substantially. The company's $40 billion commitment from Google in late April likely added credibility with risk-averse enterprise buyers who want to know their vendor is not going anywhere.
One caveat worth noting: Ramp's index reflects what companies actually spend, not what they use. OpenAI's broader ecosystem, including GitHub Copilot and the free ChatGPT tier, is not captured here. The numbers describe the paid enterprise market, which is the commercially meaningful one, but they undercount OpenAI's total footprint considerably.
Even so, a six-point gain in two months in a market this large is substantial movement. Enterprise AI is not winner-take-all, but there is probably only room for two dominant players. Anthropic appears to be locking in that second position at some speed.
Sources
- i. ramp.com
- ii. www.saastr.com
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