Anthropic Surpasses OpenAI in Paying Business Customers, Ramp Data Shows

For the first time, Anthropic has more verified business customers than OpenAI, with 34.4% of Ramp's 50,000+ corporate clients paying for Anthropic services versus 32.3% for OpenAI, according to Ramp's May 2026 AI Index. Anthropic quadrupled its business adoption over the past year, rising from 9% in May 2025. However, separate ETR data reported by SaaStr shows OpenAI still leads in enterprise usage at 56% versus Anthropic's 48% — the datasets measure different things (Ramp tracks paid transactions; ETR surveys enterprise usage intent). The trend is clear: Anthropic's focus on technical customers and tools like Cowork is driving rapid business adoption.