Microsoft Shares Up 1.75% on AI Shift

Microsoft shares rise on internal AI rollout

Microsoft (NASDAQ:MSFT) shares ticked up 1.75% on Tuesday, out‑performing the broader Nasdaq index, after Bloomberg reported that the company has begun replacing third‑party artificial‑intelligence models from OpenAI and Anthropic with its own internally developed MAI models. The MAI models have been quietly embedded into the core Microsoft Office applications Excel and Outlook, where they are already processing tens of thousands of AI prompts each week, according to an anonymous source familiar with the rollout. This internalisation represents the first public indication of the scale of Microsoft’s proprietary AI deployment and is intended to sharply reduce the massive infrastructure costs associated with the Copilot feature while keeping the functionality of the flagship software suite intact.