Anthropic beats OpenAI as the top LLM provider for business - and it's not even close

• Programming is AI's killer app.
• The top business AI, especially for programming, is Anthropic. 
• Open-source AI is lagging behind its proprietary competitors.

If you were to ask J. Random User on the street what the most popular business AI Large Language Model (LLM) is, I bet you they'd say OpenAI's ChatGPT. As of mid-2025, however, Anthropic is the leading enterprise LLM provider, with 32% of enterprise usage, according to Menlo Ventures, an early-stage venture capital firm.

Before you get too excited, though, keep in mind that Menlo Ventures is a major Anthropic investor. The firm has backed the company through several significant funding rounds, including leading their Series D round and participating in their $3.5 billion Series E, which valued Anthropic at $61.5 billion. 

Also: What happened when Anthropic's Claude AI ran a small shop for a month (spoiler: it got weird ...