DeepSeek vs Kimi: Which Chinese AI Assistant Should You Use?
Choose DeepSeek for maths, logic, coding, cheap API access or self-hosting. Choose Kimi for reading large batches of documents, organising research and writing Chinese. Both are free, so using both is reasonable.
| DeepSeek | Kimi | |
|---|---|---|
| In one line | Open-weight Chinese model with near-frontier reasoning at a fraction of the cost | Moonshot AI's model, built around long-document handling and natural Chinese |
| Pricing | Free on the web; API priced far below comparable international models | Free to use on the web |
| Access | Reachable from mainland China | Reachable from mainland China |
| Tags | Chat · Open weights · Low cost | Chat · Long context · Chinese |
| Full review·Official site ↗ | Full review·Official site ↗ |
Pricing and features change often; check the official site before relying on them.
Key differences
DeepSeek and Kimi are both Chinese models, both directly reachable from mainland China, both free on the web and both natural in Chinese — which is why people struggle to choose. In fact their centres of gravity are far apart: DeepSeek is the one that thinks, Kimi is the one that reads.
DeepSeek’s core is reasoning close to the frontier. Its deep-thinking mode lays out the derivation before giving an answer, so maths, logical analysis and code can be checked step by step. It also caters to developers: a very cheap API with a widely compatible interface, and open weights for self-hosting. Kimi puts its effort into long text: upload several PDFs and Word files at once and it searches across them, pinpoints specific passages and links information between chapters more reliably than most; paste a URL and it reads the page before answering.
Their weaknesses complement each other. Kimi still trails the frontier on complex multi-step reasoning, and code is not its strength. DeepSeek’s file handling is mainly text extraction followed by Q&A, its web interface is plain, and it can show a “server busy” message at peak times.
Choose DeepSeek if
- You solve maths or logic problems and want every step of the reasoning visible.
- You write code, debug errors or implement specific features.
- You build AI applications or run batch jobs and need a very low-cost API.
- Your data cannot leave the internal network and you need to host the weights yourself.
Choose Kimi if
- You are writing a literature review or organising research and need a batch of files read and grouped by theme.
- You work through long reports, contracts or papers and need key passages and figures fast.
- You want it to read a web link and summarise it, or search the Chinese-language web for recent information.
- You write articles, reports or summaries where natural Chinese phrasing matters.
If you are in mainland China
Neither has any barrier for users in China: direct access, phone-number signup and free everyday use, so there is no need to pick just one. A practical split is to give DeepSeek the problems that need careful thinking and give Kimi the material that needs reading first. For an industry analysis, for example, let Kimi read the sources and pull out key points, then hand those points to DeepSeek to test the logic and check the calculations. If you only install one app, students in technical fields and developers should start with DeepSeek; people in humanities, operations or reading-heavy roles should start with Kimi.