DeepSeek is a free, low-cost AI chat assistant that is especially strong at coding, reasoning and summarising long documents. You use it much like ChatGPT or Claude - at chat.deepseek.com, in its mobile app, or through an API - and for a lot of everyday work it is genuinely capable while costing little or nothing. The main catch is privacy: DeepSeek is a Chinese service and stores user data on servers in China, so it is not the tool for confidential material. This guide covers what it does well, how to use it, and when to pick something else.
What is DeepSeek?
DeepSeek is an AI assistant from a Chinese lab of the same name. It answers questions, writes and debugs code, explains hard topics, drafts documents, and summarises long or messy text. It made its name on two things: strong performance on reasoning and coding tasks, and a price far below the big Western subscription tools - the core chat is free to use.
For most people the practical pitch is simple: it does a large share of what a paid assistant does, for little or no money, and it is particularly good when the task is logical rather than creative.
How to use DeepSeek: step by step
In the browser
- Go to chat.deepseek.com.
- Create a free account with an email and password.
- Start a chat. Type a clear, specific request - DeepSeek rewards precise prompts and tends to answer the first question in a message, so ask one thing at a time.
- Use the history panel to keep projects separate.
On mobile
Install the DeepSeek app from your app store and sign in with the same account. The experience mirrors the web chat.
For developers (API)
Register for an API key in the DeepSeek developer portal, follow the API docs to wire it into your app, and test before you deploy. Because the tokens are cheap, it is a popular choice for high-volume or cost-sensitive backends.
What is DeepSeek best at?
- Coding and debugging: explaining errors, writing functions, refactoring and reasoning through logic. This is its strongest area.
- Summarising: condensing long or complex documents quickly.
- Reasoning tasks: maths, step-by-step problem solving and structured analysis.
- Drafting: emails, scripts, outlines and first drafts, though it is less creative than ChatGPT for storytelling and voice.
DeepSeek is a capable, low-cost coding model. Conrad is the role on top of it: hand over an error, a stack trace or a failing test and get a structured fix with the reasoning shown. Works on Claude, ChatGPT or DeepSeek.
View Conrad →The privacy question you should not skip
DeepSeek's low cost comes with a real trade-off. Reporting indicates user data is stored on servers in China, that it may be retained for a long time, and several governments have restricted the app on official devices. None of that makes it useless - it makes it the wrong place for anything confidential. A sensible line: use DeepSeek freely for public, low-stakes or throwaway work such as practice code, general questions, study help and rough drafts, and keep client data, personal information, trade secrets and anything regulated on a tool whose data handling you are comfortable with. Never paste passwords, customer records or proprietary source code into any free consumer AI.
Model vs method: why a cheap model is only half the job
Here is the thing people miss. DeepSeek gives you a strong, cheap engine. It does not give you a method - the way an experienced person approaches a specific job. Ask it to "fix this bug" and you get a generic attempt; give it a proper role - how to read the error, isolate the cause, check for side effects and show its reasoning - and the same model produces far better work.
That role is what a ready-made skill or agent is. Because the format is just text, the same role works on DeepSeek, ChatGPT or Claude - you paste it in and the model follows the method. For coding specifically, Conrad, the AI Bug Fixer Agent and the broader AI coding agents turn a capable model into a structured debugger. If you are still deciding between DeepSeek and the alternatives, our DeepSeek vs ChatGPT comparison weighs them side by side.
DeepSeek FAQ
Is DeepSeek free?
Yes, the core chat at chat.deepseek.com and in the mobile app is free to use, and API access is low cost. Pricing and free limits can change, so check the current terms before relying on it for heavy use.
Is DeepSeek safe to use?
It is fine for public, low-stakes work, but it stores user data on servers in China and several governments have restricted it on official devices. Do not put confidential, personal or proprietary information into it.
Is DeepSeek better than ChatGPT or Claude?
It is very strong on coding and reasoning for the price, and often cheaper. ChatGPT and Claude generally lead on creative writing, polish and the broadest feature sets. Many people use DeepSeek for logic-heavy tasks and a Western tool for sensitive or creative work.
What is DeepSeek best used for?
Coding and debugging, summarising long documents, maths and step-by-step reasoning, and quick first drafts. It is less suited to nuanced creative writing or anything involving confidential data.
Can I use my AI skills and prompts on DeepSeek?
Yes. A skill or prompt is just structured text, so the same role you would use in Claude or ChatGPT works in DeepSeek - you paste it in at the start of a chat and the model follows the method.
DeepSeek gives you a cheap engine. Conrad gives you the mechanic - how to read the error, isolate the cause and propose a fix without breaking three other things. Paste the role in and put the model to work.
View Conrad →In short:
DeepSeek is a cheap, strong model for coding and reasoning - just keep confidential work off it. To get professional-grade output, give it a ready-made role like Conrad, grab the five-agent Coding Agent Bundle, or browse all skills. Everything runs on Claude, ChatGPT or DeepSeek.
