Microsoft is working on adding internal and third-party AI models to Microsoft 365 Copilot to diversify from OpenAI and reduce costs.Microsoft is seeking to reduce 365 Copilot's reliance on OpenAI due to concerns about cost and speed for enterprise users.In addition to training its own models, Microsoft is customizing open-weight models to make 365 Copilot faster and more efficient.Microsoft is tracking these efforts closely, and the move mirrors how other Microsoft business units have diversified their use of AI models.