Complete DeepSeek API Tutorial: From Registration to Usage, This Article Is All You Need

Today I saw many friends asking: How to use DeepSeek API? Can you explain it in detail?

As someone deeply involved in the AI programming field, I'm Programmer Wanfeng, with over 300k followers across the web, author of the python-office open source project. I'll make a complete tutorial for everyone.

I'm Programmer Wanfeng. If you want to read more AI programming related articles, you can visit my website: https://www.python4office.cn/

The reason I wrote this tutorial is because DeepSeek API is really too cheap — 1/70 the price of GPT-4, many people want to use it but don't know how to start.

📝 Step 1: Register an Account

First, go to the DeepSeek official website to register an account.

**Steps:

Open DeepSeek official website
Click register, use phone number or email
Complete registration, log in to the backend
Enter the API management page

**Precautions:

New users may have free quota
It is recommended to test with small amounts first, don't recharge too much directly
Pay attention to protecting your API Key, don't disclose it

🔑 Step 2: Get API Key

After logging in to the backend, find the API Key management page and create a new API Key.

**Steps:

Log in to DeepSeek backend
Find API Key management
Click to create a new API Key
Give the API Key a name, such as My Blog
Copy and save it properly

**Important Tip:
The API Key is only displayed once. Be sure to copy and save it properly. If you lose it, you can't get it back, you can only create a new one.

💻 Step 3: Use the API

DeepSeek API is compatible with OpenAI format, so you can use OpenAI's SDK to call it.

Python Example Code

from openai import OpenAI

client = OpenAI(
    api_key="Your API Key",
    base_url="https://api.deepseek.com/v1"
)

response = client.chat.completions.create(
    model="deepseek-chat",
    messages=[
        {"role": "system", "content": "You are a useful AI assistant."},
        {"role": "user", "content": "Hello"}
    ]
)

print(response.choices[0].message.content)

It's that simple!

💰 Step 4: Price Description

The price of DeepSeek API is very cheap:

Model	Input Price	Output Price
deepseek-chat	——	——

**The price is 1/70 of GPT-4!

What does this mean? It means you can use it confidently without worrying about API costs.

🎯 Step 5: Practical Application Scenarios

Let me share several practical application scenarios of DeepSeek API:

Scenario 1: Code Completion and Generation

Use DeepSeek API to help you write code, complete code, and debug.

Scenario 2: Document Generation

Use DeepSeek API to help you generate technical documents, project descriptions, and API documents.

Scenario 3: Data Analysis

Use DeepSeek API to help you analyze data, generate reports, and create visualizations.

Scenario 4: Office Automation

Use DeepSeek API to help you process Excel, generate PPT, and write emails.

⚠️ Precautions

When using DeepSeek API, there are several precautions:

**Protect API Key:
Don't submit the API Key to GitHub, don't disclose it in public places.
**Test with small amounts first:
Recharge a small amount first to test, recharge more when there are no problems.
**Set usage limits:
Set usage limits in the backend to prevent overspending.
**Monitor usage:
Regularly check API usage to keep track of consumption.

📚 Recommended Learning

If you want to get started with DeepSeek API as soon as possible, these articles are recommended:

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