What Is DeepSeek?DeepSeek 是什么？
DeepSeek is a large language model series from Hangzhou-based DeepSeek （深度求索）. Its two flagship models are V3, a 671B-parameter Mixture-of-Experts chat model, and R1, a reasoning model that thinks step by step before answering.DeepSeek 是杭州深度求索推出的大模型系列。旗舰模型有两个：V3（671B 参数混合专家对话模型）和 R1（回答前逐步思考的推理模型）。
Both models are released with open weights under the MIT license — a rarity among frontier labs. This sparked a wave of local deployments and fine-tunes, and put real pricing pressure on the whole industry.两个模型均以 MIT 协议开源权重——在头部大模型厂商中极为罕见。这掀起了本地部署和微调热潮，也给全行业带来了价格压力。
You can use DeepSeek three ways: free chat on the web and app, a low-cost API at platform.deepseek.com, or self-hosted via tools like Ollama.使用 DeepSeek 有三种方式：网页和 App 免费对话、platform.deepseek.com 的低价 API，或用 Ollama 等工具本地部署。
For reasoning-heavy work in Chinese — math, code debugging, long-document analysis — DeepSeek-R1 is the strongest free option available. The open weights (MIT) plus an API that undercuts competitors on price make it the default pick for developers on a budget. If you need image or video generation, pair it with a multimodal tool instead.
做中文深度推理任务——数学、代码调试、长文档分析——DeepSeek-R1 是目前最强的免费选择。权重开源（MIT）加上价格远低于同行的 API，是预算有限的开发者的默认选项。如果需要图像或视频生成，再搭配一个多模态工具即可。
— 中国吧 AI Tools Hub Editorial Team
Who Should Use DeepSeek?谁适合使用 DeepSeek？
✓ Good Fit For适合以下场景
- Developers who want a cheap, capable LLM API想要便宜好用的大模型 API 的开发者
- Students and researchers needing strong reasoning for math/code需要强推理能力（数学/代码）的学生和研究者
- Anyone wanting to self-host an open model via Ollama想用 Ollama 本地部署开源模型的用户
✕ Not Ideal For不适合以下场景
- Users who need built-in image/video generation需要内置图像、视频生成功能的用户
- Those needing guaranteed availability at peak times高峰期需要绝对稳定服务的用户
Getting Started with DeepSeekDeepSeek 快速开始
1. Open deepseek.com and sign up / log in打开 deepseek.com 注册并登录2. Start chatting on web or app; toggle Deep Think (R1) for hard problems在网页或 App 开始对话，难题打开深度思考（R1）3. Developers: get an API key at platform.deepseek.com (OpenAI-compatible)开发者到 platform.deepseek.com 获取 API Key（兼容 OpenAI 格式）Key Features核心功能
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Deep Thinking (R1)深度思考（R1） — Step-by-step reasoning before answering; excels at math, code, and logic.回答前逐步深度思考，在数学、代码和逻辑推理上表现突出。
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Web Search联网搜索 — Browse the web for up-to-date information beyond the training cutoff.联网获取训练数据之外的最新信息。
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File Upload & Analysis文件上传解析 — Upload PDFs, Word docs, and spreadsheets for analysis and Q&A.上传 PDF、Word、表格进行解析和问答。
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Code & Math代码与数学 — Strong code generation, debugging, and explanation in major languages.主流编程语言的代码生成、调试与讲解能力强。
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Cheap API低价 API — OpenAI-compatible API at a fraction of competitors' prices (see official site).兼容 OpenAI 格式的 API，价格远低于同类（以官网为准）。
Pros & Cons优缺点
✓ Good Fit For适合以下场景
- Top-tier reasoning (R1) among free models免费模型中顶尖的推理能力（R1）
- Open weights (MIT) — self-host via Ollama权重开源（MIT），可本地部署
- Very low API prices (see official site)API 价格很低（以官网为准）
- Strong Chinese comprehension中文理解能力强
✕ Not Ideal For不适合以下场景
- No image or video generation built in暂无图像、视频等多模态生成功能
- Service can be busy during peak hours高峰期服务可能繁忙
Use Cases应用场景
Popular ways people use DeepSeek.人们使用 DeepSeek 的常见场景：
📝 Long Document Analysis长文档分析
Upload a long PDF and ask targeted questions; get answers grounded in the source.上传长 PDF 定向提问，获得有出处的回答。
💻 Code Debugging代码调试
Debug errors, explain algorithms, and generate boilerplate across languages.调试报错、讲解算法、生成各语言样板代码。
🔬 Math Reasoning数学推理
Step-by-step solutions for math problems, from homework to competition level.从作业到竞赛级的数学题分步解答。
🔌 Low-Cost API Integration低成本 API 集成
Drop-in OpenAI-compatible API for chatbots and agents at very low cost.以极低成本为聊天机器人和 Agent 接入兼容 OpenAI 的 API。
Similar AI Tools相似 AI 工具
If DeepSeek doesn't fit your needs, here are other popular AI tools you might consider:如果 DeepSeek 不符合你的需求，可以看看这些热门 AI 工具：