Microsoft replaces OpenAI and Anthropic in Office apps
Microsoft is quietly swapping out top-tier models from OpenAI and Anthropic across Excel and Outlook, replacing them with its own in-house MAI models to cut soaring bills. Microsoft AI chief Mustafa Suleyman said Anthropic is "extremely expensive" and aims to eliminate that spend completely. The change handles tens of thousands of weekly prompts, marking a clear pivot toward cheaper, self-reliant infrastructure.