Two chat & assistants tools, one decision. Here is the honest split.
| Kimi | Microsoft Copilot | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Best at | Feeding whole books, long PDFs, or codebases into one conversation and asking precise questions. | People living in the Microsoft ecosystem: Office docs, Edge, and Windows. |
| In short | Moonshot's assistant with a very long context window and strong document Q&A, free to use. | Microsoft's AI assistant across Windows, Edge, and Microsoft 365 - web-grounded answers and document help. |
| On Atlas | 3 starter prompts | 3 starter prompts |
Pick Kimi when the job is Feeding whole books, long PDFs, or codebases into one conversation and asking precise questions.. Pick Microsoft Copilot when the job is People living in the Microsoft ecosystem: Office docs, Edge, and Windows.. Still torn? Run one real task through both free tiers. An hour of testing beats a week of reviews.
I need to [task]. Ask me the three questions that would most improve your answer, then answer using what I give you.