Anthropic has surpassed OpenAI in enterprise AI adoption, capturing a 34.4% market share in April 2026, according to a recent analysis report. This marks the first time Anthropic has led the enterprise market, edging out OpenAI's 32.3% share. The report indicates that U.S. enterprise AI adoption has climbed to 50.6%, with a significant reliance on large model tools. Anthropic's growth is attributed to its robust offerings in software development and document-intensive workflows, particularly through its Claude models, which handle over 25 billion API calls monthly. Notably, more than 70% of Fortune 100 companies have integrated Claude-related tools, enhancing its presence in sectors like finance, law, and R&D. Analysts suggest the enterprise AI market is shifting towards a performance- and cost-driven landscape, with declining model switching costs contributing to market share volatility.