ChainCatcher news, according to sources, Microsoft has been working to increase both 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 is seeking to reduce its reliance on the AI startup, which is different from the way Microsoft has boasted about its access to OpenAI models in recent years.Sources say that in addition to training its own smaller 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 the aim of this move is to lower the costs of running 365 Copilot and potentially pass the savings on to end customers.