Anthropic Gaining Market Share From OpenAI

Something shifted in the market for AI services sometime in early 2025, and it started, as these things often do, with a values disagreement. Anthropic began seeing a meaningful uptick in demand after OpenAI announced partnerships with the United States military — a decision that drew sharp criticism from users who had chosen these tools partly on the assumption that certain lines wouldn't be crossed. Discomfort became movement. Movement became data. By May 13th, Ramp's monthly AI Index — drawn from actual business spending patterns across fintech customers — showed something that had never appeared in the numbers before: Anthropic now has more verified business customers than OpenAI. Not more revenue, necessarily, not more compute. More customers. That is a different kind of signal, and a harder one to dismiss.

If confirmed, here is what this means. The AI market is not a single loyalty structure built around whoever got there first — it is a set of ongoing bets that enterprises are quietly revising. A business switching its AI vendor is not a casual act; it involves procurement cycles, integration costs, retraining. That companies are doing it anyway tells you the gap in trust or capability or values reached a threshold worth paying to cross. For OpenAI, the customer count metric is the one that matters for long-term platform lock-in; you can lose a funding round and recover, but losing the enterprise relationship layer is slower damage that compounds. For Anthropic, the pressure is now to actually deserve the migration — to hold the line on the principles that attracted these customers and simultaneously close whatever capability gaps remain.

Watch for whether OpenAI's next major product announcement or policy clarification is quietly aimed at winning back enterprise confidence, and whether Anthropic's customer count lead holds through Q3 data — that would tell us whether this is a trend or a moment.

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