Ramp · 2026-05-13 · major
Anthropic Surpasses OpenAI in Business Adoption for the First Time — Ramp AI Index Shows 34.4% vs 32.3% in April 2026
Ramp's May AI Index, drawn from spending on 50,000+ corporate cards, shows Anthropic at 34.4% business adoption and OpenAI at 32.3% — the first time Anthropic has held the top spot. Overall AI adoption ticked up to 50.6%.
Ramp's monthly index of corporate-card spend shows Anthropic edging past OpenAI in B2B paid adoption for the first time.
Key specs
| Anthropic business adoption (april 2026) | 34.4% |
|---|---|
| Anthropic mo m change | +3.8% |
| Open ai business adoption (april 2026) | 32.3% |
| Open ai mo m change | -2.9% |
| Overall ai adoption | 50.6% |
| Anthropic may 2025 → april 2026 | 9% → 34.4% |
What is it?
The Ramp AI Index is a monthly read on which AI vendors paying businesses are actually swiping cards for. The May 2026 edition, published May 13 by Ramp lead economist Ara Kharazian, covers April spending across more than 50,000 Ramp-using companies. Anthropic landed at 34.4% adoption versus OpenAI's 32.3% — the first crossover the index has recorded.
How does it work?
Ramp counts a company as 'adopting' a vendor if it pays the vendor via Ramp corporate card or invoiced billing in the period. The methodology captures who is paying, not consumption or revenue, so OpenAI's bigger enterprise deals are not fully reflected. Year over year, Anthropic climbed from 9% to 34.4% while OpenAI moved 0.3 points; April alone saw Anthropic +3.8 and OpenAI -2.9.
Why does it matter?
Business-card spend is the closest public proxy for which model providers are showing up on real expense reports, and the gap had been the durable Anthropic-vs-OpenAI talking point for two years. Kharazian flags three headwinds that could erase the lead — Anthropic's incentive to push more expensive tiers, recent service degradation, and pricing changes that tripled image-prompt token costs.
Who is it for?
AI vendor strategists, investors, enterprise buyers benchmarking peer adoption