Anthropic Tops OpenAI 34.4% to 32.3% in Ramp's May 2026 AI Index
The Ramp AI Index is a monthly report from US fintech firm Ramp that tracks how 50,000+ American businesses spend on AI through their corporate cards. In the May 2026 release, Anthropic's Claude overtook OpenAI's ChatGPT for the first time. Because the AI a company pays for usually ends up on its employees' desks, this shift matters far beyond the headlines.
What the Ramp AI Index Showed in May 2026
The new numbers are Anthropic 34.4% vs OpenAI 32.3%, a gap of 2.1 points. It looks narrow, but this is the first time Anthropic has ever led OpenAI in US business AI spend. Ramp economist Ara Kharazian told TechCrunch that Anthropic was already ahead in tech, finance, and professional services - the heavy AI-using sectors - and is now closing the remaining gap in other industries.
Why the 9% to 34.4% Jump Is the Real Story
The speed is what makes this move historic. One year ago, in May 2025, Anthropic's business share was just 9%. Twelve months later it sits at 34.4% - roughly 26 points of growth, or nearly 4x. Over the same window, OpenAI's share fell 1 point. The growth engine is Claude Code (Anthropic's AI coding tool), which has become the default at many tech firms and pulled their corporate cards along with it.
Claude for Small Business and the Next AI Battleground
Anthropic is pressing the advantage. On May 13 it launched Claude for Small Business inside Claude Cowork, with one-click connectors to QuickBooks (accounting), Canva (design), Docusign (e-signature), HubSpot (CRM), and PayPal (payments). A 10-city free AI workshop tour starting in Chicago will train 100 small business leaders per stop. The prize: the US has 36 million small businesses generating 44% of GDP. The next AI battleground isn't the Fortune 500, it's Main Street.
So How Does This Affect You?
If your employer changes which AI it pays for, the tool you spend hours in every day changes with it. The Ramp signal suggests more US companies will switch to Claude over the next 12 months, and similar reshuffles often follow in Europe and Asia. That said, analysts expect Anthropic's lead to be tested. Industry observers cite two pressures - compute constraints and the cost of token-based pricing - while OpenAI has already responded by offering new business customers two months of free Codex usage.
Key Takeaways
① First ever lead - Ramp's May data shows Anthropic 34.4% vs OpenAI 32.3% in US business AI spend.
② Near 4x in 12 months - Anthropic jumped from 9% to 34.4% while OpenAI slipped a point in the same period.
③ Main Street is next - Claude for Small Business and a 10-city training tour aim at 36M US SMBs.
The AI platform war is no longer just about who lands the Fortune 500. It's about whose tool ends up on a coffee shop owner's iPad, and the next few Ramp and OpenRouter reports will show whether this lead hardens or evaporates.
👉 Claude Code Limits Doubled - Anthropic SpaceX 220K GPU Deal (2026.05) - also worth a read.
📌 Sources: TechCrunch, Axios, VentureBeat (2026)
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