Anthropic has overtaken OpenAI to become the most-used provider of large language models among enterprises, according to a report from Menlo Ventures. The study found Anthropic holding 32% of the enterprise LLM market by API usage, ahead of OpenAI at 25%.

A sharp reversal since 2023

The shift marks a dramatic turnaround. In 2023, OpenAI commanded roughly 50% of enterprise usage while Anthropic sat at about 12%. Two years later those positions have effectively flipped, underlining that early brand dominance does not guarantee lasting share once real production workloads take over.

Coding is Anthropic’s stronghold

Anthropic’s lead is even wider in software development, where its Claude models hold around 42% of the enterprise market — the largest of any provider by a clear margin. The report credits Anthropic’s momentum to the release of Claude 3.5 Sonnet in June 2024 and Claude 3.7 Sonnet in February 2025, alongside its focus on data controls, compliance and clean integration with existing enterprise systems.

The gains came against a fast-growing backdrop: enterprise LLM API spending reached about $8.4 billion in the first half of 2025.

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