Overview Microsoft Copilot is Microsoft's umbrella brand for AI across the entire Microsoft stack — Windows, Office, Edge, Teams, Bing, GitHub, Dynamics, and the Azure developer tools. Launched in 2023 as a rebrand of Bing Chat and now spanning at least five distinct products under one name, Copilot is the default AI most Windows users will encounter first, because Microsoft has spent the last three years wiring it into the operating system and the productivity suite that most of the working world already lives in. Under the hood, consumer Copilot runs on a mix of OpenAI's GPT 5 family and Microsoft's own MAI 1 models, with the routing largely invisible to users. Practically, the model quality is competitive with ChatGPT Plus — because for most conversations it is ChatGPT Plus with a Microsoft skin — and the differentiation lives entirely in the integration surface. Copilot is not the sharpest model on the market. It is the model that opens automatically when you press the Copilot key on your keyboard. The one line positioning: Microsoft Copilot is the frontier assistant to pick when your organization runs on Microsoft 365, when you spend most of your day in Word, Excel, PowerPoint, and Outlook, or when Windows is your operating system and you want the AI baked into it rather than living in a browser tab. It is not the best AI for careful creative writing (Claude wins), not the best for image and video generation depth (ChatGPT wins), and not the best…