Microsoft Copilot vs ChatGPT for Work: Which One to Use?

Microsoft Copilot vs ChatGPT for work: which one should you use? In this lesson I give both the exact same notes and the exact same request, and compare them fairly on screen. Both write a good update, both add a line I never said, and the real difference turns out to be what each one can see. Plus the one rule that decides which tool to use, and a prompt managers can use to write a five-line team guideline. In this lesson: The same notes and the same request in Copilot and in ChatGPT The line each one added that I never wrote How to ask which sources it used What Copilot can see that ChatGPT can't on its own: your email, meetings and files GPT and Claude models inside Copilot The rule that decides which tool to use at work A five-line team guideline for managers Prompts from this lesson (copy and try them): Draft a 120-word project update for my manager from these notes: [your notes]. Three bullets: Done, Next, Blocked. Which of my sources did you use for this answer: email, meetings, Teams, files? What did [names] ask me to do in our emails about [project]? Write a five-line team guideline on which AI tool to use for which task, based on this policy: [paste your policy]. Plain language. Chapters: 0:00 Same notes, same request 0:21 The test: Copilot 1:44 The test: ChatGPT 2:28 So which one is better? 2:48 The real difference: your work data 4:04 GPT and Claude inside Copilot 4:23 The rule that decides 4:56 For managers: one team rule 5:41 Recap: three things to do today This is Lesson 6 of Copilot at Work: 30-Day Microsoft 365 Copilot Course. Watch the whole course in order:    • Copilot at Work: 30-Day Microsoft 365 Copi...   Next lesson: How to catch up on email and Teams after time off with Copilot.    • How to Catch Up on Email After Vacation Wi...   Sample work, fictional project. Tested in September 2026 with Microsoft 365 Copilot (Premium) and ChatGPT. Independent training. Not affiliated with or endorsed by Microsoft or OpenAI. #MicrosoftCopilot #ChatGPT #Microsoft365