One is the strongest general assistant money can buy. The other lives inside your Office suite and reads your files. The right choice depends on your job, not the benchmarks.
People frame this as ChatGPT vs Copilot, but the real question is "general assistant vs Office layer." ChatGPT Plus ($20/month) is the strongest all-round consumer AI: best ecosystem, voice, custom GPTs, broad model access. Microsoft 365 Copilot ($30/user/month on top of M365) is not trying to be that — it's AI threaded through Word, Excel, PowerPoint, Teams, and Outlook, grounded in your company's own files via Microsoft Graph.
| Task | ChatGPT Plus | M365 Copilot | Winner |
|---|---|---|---|
| Draft a document from scratch | Excellent | Good | ChatGPT |
| Build a slide deck from a brief | Manual assembly | 6–9 min usable draft | Copilot, decisively |
| Summarise your own meeting/files | Cannot see them | Graph-grounded, cited | Copilot |
| Spreadsheet analysis | Strong (Advanced Data Analysis) | Patchy on messy data | ChatGPT |
| General knowledge & reasoning | Frontier models | Good, narrower scope | ChatGPT |
A Copilot seat effectively costs $30 + your M365 licence — roughly triple ChatGPT Plus. Our modelling across role types found Copilot's ROI concentrates in deck-heavy and meeting-heavy roles (consultants, PMs, executives), where the PowerPoint and Teams-recap workflows alone recover the fee. For engineers, analysts, and most individual contributors, ChatGPT Plus (or Claude Pro) delivers more capability per dollar.
ChatGPT Plus 9.1 vs M365 Copilot 8.0 as general tools — but inside PowerPoint and Teams, Copilot does things ChatGPT structurally cannot. Buy the integration if your work is the integration; otherwise buy the better brain.
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