TITLE: Ramp Data Confirms Anthropic Now the Most Adopted AI in US Business DATE: 2026-06-14 COMPANY: Anthropic TOPIC: Enterprise AI SUMMARY: The June 2026 Ramp AI Index, drawn from real corporate card spend across more than 50,000 US businesses, shows Anthropic at 41% business adoption versus OpenAI at 39.5%. It is the first time in the index's history that Anthropic leads OpenAI, and the gap is widening. Anthropic has grown from 0.03% of US businesses in June 2023 to 41% in June 2026. WHAT CHANGED: Ramp, the corporate card and finance automation platform, publishes a monthly AI Index tracking which AI tools US businesses are paying for. The data comes from actual billing records, not self-reported surveys. In the May 2026 edition, Anthropic crossed OpenAI for the first time. The June 2026 edition, published on June 13, confirmed the shift is holding and accelerating. Anthropic grew from 34.4% in April 2026 to 41% in June 2026, adding 2.5 percentage points in the most recent month alone. OpenAI, by contrast, dropped 0.1 percentage points to 39.5% and has been essentially flat since the crossover began. The gap has widened from 2.1 percentage points in May to 1.5 percentage points in June, depending on measurement, with Ramp noting methodological updates to better capture enterprise spend on both platforms. The growth trajectory for Anthropic is difficult to overstate. In June 2023, Anthropic registered 0.03% penetration in Ramp's business dataset. By April 2025, that number had reached 7.94%. By April 2026 it was 34.44%, and by June 2026 it is 41%. That is a 1,300-fold increase over three years, with most of the growth concentrated in the last twelve months. OpenAI still holds a significant position in the market and has not lost business at scale. But its growth has stalled. OpenAI grew US business adoption by only 0.3% over the past year, compared to Anthropic's near-quadrupling in the same period. WHY IT MATTERS: Enterprise AI vendor decisions are consolidating faster than most operators realise. The window for businesses to run informal AI experiments is closing. Finance teams are now authorising ongoing subscriptions. The question is no longer which AI to try, it is which AI to build on. The competitive dynamic has structurally shifted. For three years, "use ChatGPT" was the default response to any AI request in a business setting. That default is now empirically incorrect. The majority of US businesses paying for AI are paying for Claude. Safety and governance are influencing procurement decisions. Anthropic's Constitutional AI approach and its positioning on enterprise governance have resonated with legal, compliance, and IT security teams who influence or control software purchasing. This is not a developer-led adoption curve. It is a broader organisational uptake. OpenAI's strengths are still real but increasingly contested. ChatGPT Enterprise remains strong, and OpenAI has significant API penetration among developers. But in the mid-market businesses that make up the bulk of Ramp's dataset (10 to 500 employees), Anthropic is now the more common choice. The risks to Anthropic's position are worth tracking. Analysts have flagged three threats: compute costs that scale with usage, supply constraints as Anthropic's model demand outpaces infrastructure, and a token-pricing model that becomes expensive for heavy users. None of these have materialised as adoption killers yet, but they are the most credible challenges to Anthropic's current trajectory. DAVID & GOLIATH ANALYSIS: The Ramp AI Index matters because it is one of the few data sources that measures what businesses actually pay for, not what they say they prefer in a survey or what their IT team approved in theory. Spend data is the truth. And the truth in June 2026 is that the majority of US businesses paying for AI have chosen Anthropic. For operators who built early workflows on OpenAI, this does not require an immediate switch. OpenAI remains capable and broadly available. But it does require a reassessment. If your AI strategy is "we use ChatGPT", you are now describing the minority position in US enterprise. The question is whether you are there by deliberate choice or by inertia. Those are very different answers to give to your board. The deeper implication is about what drove the shift. Anthropic did not win on speed to market or consumer brand recognition. It won by being the choice of enterprise buyers who had governance, legal review, and compliance in their procurement process. That is a durable advantage. Enterprises that go through that process tend to stay with their decision. 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