Anthropic closes the gap: 30% of U.S. businesses now pay for Claude
Twelve months ago, OpenAI had a commanding lead in paid business AI adoption. That lead is nearly gone.
Anonymized spend data from over 50,000 U.S. businesses on the Ramp platform shows that as of March 2026, 35.2% of U.S. companies pay for OpenAI versus 30.6% for Anthropic, a gap of just 4.5 percentage points. The data counts only paid subscriptions and excludes free-tier usage.
How Fast Anthropic Moved
In January 2025, OpenAI sat at 16.8% of U.S. businesses and Anthropic at 4.1%, a spread of nearly 13 points. By March 2026, Anthropic had grown more than sevenfold in 14 months. OpenAI roughly doubled over the same period.
The driver, according to the source, was enterprise-native tooling. Claude Code, Anthropic’s coding assistant, and Cowork, its workflow collaboration platform, were scaled aggressively across late 2025 and into 2026, which maps directly to the steepest part of Anthropic’s adoption curve.
Everyone Else Is Far Behind
Google’s AI products, which span Gemini, Vertex AI, and Workspace add-ons, have hovered between 3% and 4.5% of U.S. businesses for most of the past three years despite heavy investment. xAI climbed from effectively zero in early 2024 to 1.9% in March 2026, a real gain but still a small footprint.
OpenAI has responded with its own developer coding tool, Codex. The source notes Codex launched months after Claude Code and had reached four million active users as of April 21, 2026.
The Operator Takeaway
Enterprise AI spend is consolidating fast around two providers. If you are making procurement decisions or advising clients on AI stack choices, the practical options are narrowing to OpenAI and Anthropic. Everything else is a distant third.
I’m founder of BizStack at Cagri Sarigoz LLC and a passionate advocate for entrepreneurs.
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