DeepSeek for Beginners: Free AI Chat, and What to Know Before You Use It

Features and prices checked October 14, 2026.

What is DeepSeek?

DeepSeek is an AI chatbot made by a Chinese company, Hangzhou DeepSeek Artificial Intelligence Co., Ltd. You can use the official chat for free at chat.deepseek.com and in the official DeepSeek app for iPhone and Android. Programmers can also connect to it through a paid API, which bills by usage.

It's popular because it's free, and strong at math, reasoning, and code.

Key strengths

1. The official chat is free. There's no official "Plus" or "Pro" chat subscription. The paid part is the developer API, billed per use.
2. Choose fast or thorough. The app offers a quicker mode and a stronger "Expert" mode, plus a "DeepThink" switch that turns step-by-step thinking on or off. (Mode names have changed before, so check the live app.)
3. Huge memory for long text. DeepSeek's current API model lists a 1 million token context window, meaning it can take in very long inputs.
4. Open models. DeepSeek publishes its V4 models as open weights on Hugging Face under the MIT license, so developers can run them on their own hardware.
5. Low API prices for builders. DeepSeek charges per token and offers off-peak rates at 50% of peak rates.

Best use cases

Before you start: two safety rules

1. Only use the official site and app. Type chat.deepseek.com yourself. In app stores, check that the seller is "Hangzhou DeepSeek Artificial Intelligence Co., Ltd." Fake "DeepSeek Plus" sellers and browser add-ons exist. The real chat never asks you to pay.
2. Don't share private information. DeepSeek's privacy policy says it collects, processes, and stores your data in the People's Republic of China, and may use your inputs to train its models. Don't paste in personal, financial, health, or work-confidential details.

How-to guides

1. How to get everyday writing help for free

Who it's for: Anyone who wants a free AI writing helper.

Steps:

1. Type chat.deepseek.com into your browser, or install the official app.
2. Click Sign up and create an account.
3. Click in the chat box.
4. Describe what you want to write.
5. Press Enter.
6. Ask for changes until you're happy.

Copy-paste prompts:

Write a short, friendly message to my neighbors inviting them to a backyard cookout this Saturday at 4 pm. Keep it under 60 words.

Copy

Rewrite this paragraph so it's clearer and easier to read, at an 8th-grade level: [paste text]

Copy

Pro tip: Try the same prompt in both the fast mode and Expert mode. You may like one style better.

Common mistake: Paying for a "DeepSeek Plus" upgrade from an ad or browser extension. DeepSeek doesn't sell a chat subscription.

2. How to work through a math problem step by step

Who it's for: Students and anyone brushing up on math.

Steps:

1. Open the official DeepSeek chat.
2. Turn on DeepThink (the thinking switch by the chat box).
3. Choose Expert mode for harder problems.
4. Type the problem exactly as written.
5. Ask it to explain each step simply.
6. Try the next problem yourself, then ask it to check your work.

Copy-paste prompts:

Solve this step by step and explain each step like I'm in 9th grade: A train leaves at 2 pm going 60 mph. Another leaves the same station at 3 pm going 80 mph. When does the second train catch up?

Copy

Here's my work on this algebra problem. Find my mistake, but don't give me the final answer: [paste work]

Copy

Pro tip: The "thinking" text can be long. Focus on the final explanation, and ask "summarize the steps in 3 lines."

Common mistake: Trusting the answer without checking. AI can still make math errors. Plug the answer back into the problem to test it.

3. How to get coding help

Who it's for: Beginner programmers and hobbyists.

Steps:

1. Open the official DeepSeek chat.
2. Pick Expert mode for harder code questions.
3. Say what language you're using and what you're trying to do.
4. Paste your code or error message.
5. Ask for an explanation, not just a fix.
6. Test the fix on your own computer.

Copy-paste prompts:

I'm learning Python. Explain what this code does line by line, in simple words: [paste code]

Copy

I get this error when I run my JavaScript: [paste error]. What does it mean, and how do I fix it? Explain why the fix works.

Copy

Pro tip: Ask for "the simplest working version." Beginners learn more from short, clear code.

Common mistake: Pasting passwords, API keys, or company code into the chat. Remove secrets before you paste anything.

4. How to summarize a long public document

Who it's for: Researchers and curious readers with long, public texts.

Steps:

1. Open the official DeepSeek chat.
2. Use the upload button to add your file, or paste the text.
3. Ask for a summary with a clear format.
4. Ask for the most important quotes.
5. Check those quotes in the original.

Copy-paste prompts:

Summarize this public report in 8 bullet points. Then list the 3 most surprising findings, with a quote for each.

Copy

Explain this research paper to a high school student. What did they test, what did they find, and why does it matter?

Copy

Pro tip: Use this for public documents, like government reports or published papers. Not private files.

Common mistake: Uploading private documents. Remember, DeepSeek stores data in China and may use inputs for training.

5. How to build with the DeepSeek API (for developers)

Who it's for: Developers who want to add AI to their own app or script.

Steps:

1. Go to platform.deepseek.com and create an account.
2. Add credit to your account. (The API is pay-as-you-go.)
3. Create an API key. Keep it secret.
4. Read the docs at api-docs.deepseek.com for the current model name.
5. Make a test call using the docs' example code.
6. Watch your usage, and run big jobs off-peak to save money.

Copy-paste prompts (for a system message in your app):

You are a helpful customer support assistant for a bike shop. Answer in 3 sentences or fewer. If you don't know, say "Let me connect you with a person."

Copy

Summarize the user's text in 3 bullet points. Use plain English. Don't add facts that aren't in the text.

Copy

Pro tip: DeepSeek's off-peak rates are 50% of peak rates. Schedule big batch jobs for off-peak hours.

Common mistake: Putting your API key inside your code or a browser add-on. Store it in an environment variable.

Free vs paid: what does DeepSeek cost?

Checked October 14, 2026.

When is paying worth it?

• For regular users: never. The official chat is free. There's nothing to upgrade.
• For developers: the API is worth it when you need to call the model from your own code. Check the live pricing page, because rates change.

Limitations, and when to use a different AI

• Privacy. Data is stored in China and may be used for training. For sensitive work, consider Claude (training opt-out on every plan) or Microsoft Copilot with a work account.
• Free can mean slow. During busy times, you may wait or need to retry.
• No image generation confirmed. We couldn't confirm image creation in the official chat. For pictures, use ChatGPT, Gemini, Grok, or Midjourney.
• Need cited sources? Perplexity.
• Studying your own notes? NotebookLM (Gemini Notebook).
• Live news from X? Grok.
• Free chat inside the apps you already use? Meta AI in WhatsApp, Instagram, and Messenger.

FAQ

Is DeepSeek free? Yes. The official DeepSeek chat at chat.deepseek.com and the official app are free. Only the developer API costs money, billed per use. Any "DeepSeek Plus" subscription is not from DeepSeek.

Is DeepSeek safe to use? The official app is a real product, but think about privacy. DeepSeek's privacy policy says it stores data in China and may use your inputs to train its models. Don't share personal or confidential information.

DeepSeek vs ChatGPT: which is better? DeepSeek is fully free and strong at math and code. ChatGPT has more features, like images, voice, and Study mode, plus paid plans with more power. For private or work tasks, many people prefer ChatGPT or Claude.

Why is DeepSeek so cheap? DeepSeek says its newer models use a more efficient design that lowers costs, and it passes some savings to API users. The chat is free for everyone.

Is DeepSeek good for coding? Yes, many people use it for coding help. Use Expert mode for harder problems, and never paste passwords or private company code.