OpenAI — Enterprise Market Share: 50%

NoteThe source directly confirms the claim. The Menlo Ventures 2025 Mid-Year LLM Market Update explicitly states: 'By the end of 2023, OpenAI commanded 50% of the enterprise LLM market.' This matches the claim's exact value (50) and time period (2023-12, i.e., end of 2023). The source is from Menlo Ventures, which is cited in the claim's context. The claim's additional context about 'dominant position before Anthropic's rise' is also consistent with the source's narrative that Anthropic has since surpassed OpenAI.