According to sources, Microsoft has been committed to increasing internal and third-party artificial intelligence models to support its flagship AI product Microsoft 365 Copilot, diversifying the existing OpenAI foundational technology and reducing costs. Microsoft is a major supporter of OpenAI, and this time Microsoft seeks to reduce its reliance on this AI startup, which is different from Microsoft's boastful approach in recent years about its access to OpenAI models. Sources say that in addition to training its own small models (including the latest Phi-4), Microsoft is also working to customize other open models to make 365 Copilot faster and more efficient. It is reported that this move aims to reduce Microsoft's costs in operating 365 Copilot and potentially pass on the savings to end customers.