What Is Kimi?Kimi 是什么？
Kimi is the AI assistant from Beijing-based Moonshot AI （月之暗面）. It became famous for one thing: handling extremely long texts — hundreds of pages in a single conversation.Kimi 是北京月之暗面（Moonshot AI）推出的智能助手，靠一件事出圈：超长文本处理——一次对话读几百页文档。
Its flagship Kimi K2 model family, including the reasoning-focused K2 Thinking, is released with open weights. The assistant is free on web and app, with an API at platform.moonshot.cn.旗舰 Kimi K2 模型系列（含深度思考版 K2 Thinking）权重开源。网页和 App 对话免费，platform.moonshot.cn 提供 API。
Beyond chat, Kimi offers file understanding (PDF/Word/Excel/PPT), web search, and a Deep Research mode for multi-step investigations.除对话外，Kimi 支持文件解读（PDF/Word/Excel/PPT）、联网搜索，以及多步调研的深度研究模式。
If your work involves long documents — contracts, papers, reports — Kimi is the most practical free choice: upload once, ask anything. K2 being open-weight is a bonus for developers. For pure reasoning puzzles, DeepSeek-R1 still has an edge, so many people keep both.
如果工作离不开长文档——合同、论文、报告——Kimi 是最实用的免费选择：一次上传，随便问。K2 权重开源对开发者是加分项。纯推理难题上 DeepSeek-R1 仍有优势，很多人两个都用。
— 中国吧 AI Tools Hub Editorial Team
Who Should Use Kimi?谁适合使用 Kimi？
✓ Good Fit For适合以下场景
- Professionals drowning in long documents被长文档淹没的职场人
- Students summarizing papers and textbooks需要总结论文教材的学生
- Developers wanting an open-weight Chinese LLM API想要开源中文大模型 API 的开发者
✕ Not Ideal For不适合以下场景
- Users needing image/video generation需要图像、视频生成功能的用户
- Those wanting a fully offline solution想要完全离线方案的用户
Getting Started with KimiKimi 快速开始
1. Open kimi.moonshot.cn and log in打开 kimi.moonshot.cn 登录2. Upload a long document or just start chatting上传长文档，或直接开始对话3. Try Deep Research mode for investigation tasks复杂调研任务试试深度研究模式Key Features核心功能
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Ultra-Long Context超长上下文 — Process hundreds of pages in a single session — contracts, papers, books.一次处理几百页文档：合同、论文、书籍。
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Deep Reasoning深度思考 — K2 Thinking reasons step by step for complex problems.K2 Thinking 版对复杂问题逐步深度推理。
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File Understanding文件解读 — Upload PDFs, Word, Excel and PPT for instant Q&A and summaries.上传 PDF、Word、Excel、PPT 即时问答和总结。
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Web Search联网搜索 — Built-in search for current events and fact checking.内置联网搜索，查时事、核事实。
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Developer API开发者 API — OpenAI-compatible API for developers at platform.moonshot.cn.platform.moonshot.cn 提供兼容 OpenAI 的 API。
Pros & Cons优缺点
✓ Good Fit For适合以下场景
- Best-in-class long-document handling长文档处理能力顶尖
- K2 weights are open-sourceK2 权重开源
- Thoughtful Chinese UX中文交互体验好
- Free to use免费使用
✕ Not Ideal For不适合以下场景
- Free tier can be limited during peak times高峰期免费额度可能受限
- Smaller third-party ecosystem than ChatGPT第三方生态不如 ChatGPT 丰富
Use Cases应用场景
Popular ways people use Kimi.人们使用 Kimi 的常见场景：
📑 Contract Review合同审阅
Drop in a long contract and ask about termination clauses, section by section.扔进长合同问终止条款，逐条定位。
🎓 Study Aid学习辅助
Summarize a textbook chapter into key points.把一章教材总结成要点。
🔍 Deep Research深度调研
Deep Research mode browses and synthesizes multi-source reports.深度研究模式自动浏览并综合多份资料成报告。
🌍 Translation翻译润色
Translate and polish long Chinese/English documents.长篇中英文档翻译润色。
Similar AI Tools相似 AI 工具
If Kimi doesn't fit your needs, here are other popular AI tools you might consider:如果 Kimi 不符合你的需求，可以看看这些热门 AI 工具：