Popular open source AI developer tool Ollama raises $65M, grows to nearly 9M users

Ollama, an open-source AI developer tool that democratizes access to open-weight AI models, has raised $65M in Series B funding and now serves 8.9M monthly developers across 85% of Fortune 500 companies, signaling strong enterprise adoption of cost-effective alternatives to proprietary AI models. This trend reflects a fundamental shift in AI economics where organizations are increasingly adopting open models for routine inference tasks to manage costs, while reserving expensive closed models for specialized use cases. IT leaders should recognize this as a strategic inflection point: the open-source AI infrastructure layer is maturing rapidly with well-funded players, creating both opportunities to reduce AI operational expenses and the need to re-evaluate AI vendor strategies.