Microsoft is reportedly replacing OpenAI and Anthropic models with its in-house ai in certain software products, including Excel and Outlook. The move is said to be a cost-cutting measure, as some reports suggest that the use of external ai models, such as those from OpenAI and Anthropic, has become too expensive. The extent and implications of this shift are not entirely clear, but it appears to be part of a broader effort by Microsoft to promote its own ai technology.