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Anthropic's growth in paying business customers over 12 months — OpenAI grew 0.3% over the same period

Anthropic quadrupled its share of paying businesses over 12 months and, for the first time, passed OpenAI in business customer adoption — 34.4% vs. 32.3% — according to Ramp's May 2026 AI Index, drawn from transaction data across more than 50,000 companies. In May 2025, Anthropic's share was 9%; a year later it is 34.4%.