According to the latest report from Ramp, a US corporate expense management platform, Anthropic is rapidly closing in on OpenAI in the enterprise AI market. In March 2026, Anthropic's share of enterprise clients surged from 24.4% to 30.6%, representing a single-month increase of 6.3 percentage points, narrowing the gap with OpenAI's 35.2% share to just 4.6 percentage points. Ramp predicts that at this growth rate, Anthropic could surpass OpenAI within two months. The report highlights that Anthropic leads in the information, financial, and professional services sectors, securing a 70% win rate among enterprises purchasing AI services for the first time, compared to OpenAI's 30%. Additionally, Anthropic's annualized revenue has exceeded $30 billion, surpassing OpenAI's $25 billion.