OpenAI — Market Share: 27%

NoteThe source directly confirms all elements of the claim. The exact passage states: 'We estimate Anthropic now earns 40% of enterprise LLM spend, up from 24% last year and 12% in 2023. Over the same period, OpenAI lost nearly half of its enterprise share, falling to 27% from 50% in 2023.' This matches the claim's exact stored value of 27, the time period (December 2025), the context (Enterprise LLM API market share per Menlo Ventures), and the narrative about OpenAI losing nearly half its market share (50% to 27%) while Anthropic overtook it (40% vs 27%).