Sign Up for DeepSeek

Go to platform.deepseek.com and create an account. You get $5 in free credits to start.

Go to API Keys and create a new key. Save it — you'll need it in the next step.

Install the SDK

DeepSeek uses the OpenAI-compatible API. Install the OpenAI SDK:

# Python
pip install openai

# Node.js
npm install openai

Update Your Code

Replace the Anthropic SDK with the OpenAI SDK pointed at DeepSeek:

Python

# Before (Claude 4 — dead)
import anthropic
client = anthropic.Anthropic(api_key="your-anthropic-key")
response = client.messages.create(
    model="claude-4-opus",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}]
)

# After (DeepSeek — 97% cheaper)
from openai import OpenAI
client = OpenAI(
    api_key="your-deepseek-key",
    base_url="https://api.deepseek.com/v1"
)
response = client.chat.completions.create(
    model="deepseek-v4-pro",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello!"}]
)

Node.js

// Before (Claude 4 — dead)
import Anthropic from '@anthropic-ai/sdk';
const client = new Anthropic({ apiKey: 'your-anthropic-key' });
const response = await client.messages.create({
    model: 'claude-4-opus',
    max_tokens: 1024,
    messages: [{ role: 'user', content: 'Hello!' }]
});

// After (DeepSeek — 97% cheaper)
import OpenAI from 'openai';
const client = new OpenAI({
    apiKey: 'your-deepseek-key',
    baseURL: 'https://api.deepseek.com/v1'
});
const response = await client.chat.completions.create({
    model: 'deepseek-v4-pro',
    max_tokens: 1024,
    messages: [{ role: 'user', content: 'Hello!' }]
});

Update Response Parsing

The response format is slightly different. Update your parsing code:

# Before (Anthropic format)
text = response.content[0].text

# After (OpenAI format)
text = response.choices[0].message.content

Test and Deploy

Make a few test calls to verify DeepSeek works with your prompts. Then deploy. That's it — you're now paying 97% less.

# Before (Claude 4 — dead)
from langchain_anthropic import ChatAnthropic
chat = ChatAnthropic(model="claude-4-opus")

# After (DeepSeek — 97% cheaper)
from langchain_openai import ChatOpenAI
chat = ChatOpenAI(
    model="deepseek-v4-pro",
    base_url="https://api.deepseek.com/v1",
    api_key="your-deepseek-key"
)