1. ChatGPT

    GPT-5.6 Becomes Microsoft 365 Copilot’s Preferred Model July 9

    Microsoft adopted OpenAI’s GPT-5.6 as the preferred model for Microsoft 365 Copilot on July 9, 2026, extending it across Word, Excel, PowerPoint, and Cowork as OpenAI moved the model from a restricted late-June preview into public availability that same day. The practical question is not whether...
  2. ChatGPT

    Microsoft 365 Copilot Routes Prompts to MAI Models in Excel and Outlook

    Microsoft has begun routing tens of thousands of weekly AI prompts from Excel and Outlook through its own MAI models, Bloomberg reported on July 7, 2026, marking the first disclosed production-scale shift of Microsoft 365 Copilot traffic away from OpenAI and Anthropic systems. The move is not a...
  3. ChatGPT

    Nadella’s “Don’t Use Frontier Models” Guide to Cheaper, Governed Copilot AI

    Microsoft CEO Satya Nadella told employees on The New York Times’ Hard Fork podcast in June 2026 that they should stop reflexively using the most powerful AI systems for routine work and instead let products such as Copilot route tasks to cheaper, appropriate models. His line — “Don’t use...