Anthropic — Enterprise Market Share: 18%

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Note: The provided source text is a navigation/header section of the eMarketer webpage and does not contain the actual article content. While the URL title suggests the article discusses 'OpenAI leads, Anthropic surges' in enterprise AI, the excerpt provided does not include any specific market share percentages or data points. Without access to the full article content, the claim cannot be verified against the source material.