Model Vendors: Who's Getting the Enterprise Dollars

Share of companies with a paid transaction with each vendor in a given month, from January 2023. Anthropic climbed from 1.5% in February 2024; OpenAI has held at 39% to 41% since September 2025.

Three things to see: every industry only rises; non-tech accelerated from late 2025, with manufacturing up 14 points in a year and finance from 60% to 74%; hospitality, the slowest, is still at 31%, far from any ceiling.

The funding-source history is not published, so the size series supplies the time dimension. Mid-sized companies lead at 66%; large companies lagged in 2023 and 2024, then accelerated to 60% from late 2025.

Category spend share is OpenAI 52% versus Anthropic 46%, but 72% of new customers choose Anthropic and 62% of switchers move to it. One side leads the stock, the other takes the flow.

A company can use several vendors at once, so shares overlap. DeepSeek never exceeded 0.3% among US companies in three years: the US market never moved to DeepSeek for its low price, so a price increase will not cost it volume here.

Opus 5 replaces an existing line and inherits its traffic, so it starts high; Fable 5 is a brand-new line growing from zero. The two cannot be measured with the same ruler. Ramp attributes spend by API usage and cannot see subscription fees, so it understates Fable's contribution.