According to online reports, according to sources, Microsoft has been committed to adding internal and third-party artificial intelligence models to support its flagship artificial intelligence product Microsoft 365 Copilot, diversify existing OpenAI basic technologies and reduce costs. Microsoft is a major supporter of OpenAI, and this time it is seeking to reduce its reliance on the artificial intelligence startup, a departure from Microsoft's boasting of its accessibility to OpenAI models in recent years. In addition to training its own small models, including the latest Phi-4, Microsoft is also working to customize other open models to make the 365 Copilot faster and more efficient, sources said. It is reported that the purpose of this move is to reduce the cost of running 365 Copilot for Microsoft and may pass on the savings to end customers.