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Future-Proof Your DeepSeek API Integration with V4 Identifiers

Update your API model parameters to the new V4 identifiers.

Transition from generic model names to specific versioned identifiers like 'deepseek-v4-pro' to ensure long-term stability and access to the latest features.

DeepSeek

The Scenario

You are a developer using DeepSeek's API and want to ensure your application is using the latest V4 models instead of relying on legacy nicknames that will soon expire.

Before & after

The old way

Developers had to use 'deepseek-chat' or 'deepseek-reasoner' without knowing exactly which underlying version was active. Migrating to a new architecture usually required rewriting API logic over 1-2 hours.

With AI

Developers can update their configuration to use 'deepseek-v4-pro' or 'deepseek-v4-flash' via the OpenAI or Anthropic SDKs. This takes about 2 minutes to update the model parameter.

The Prompt

# Update your API client configuration
import openai
client = openai.OpenAI(api_key="YOUR_KEY", base_url="https://api.deepseek.com")

response = client.chat.completions.create(
    model="deepseek-v4-pro", # Use the new version-specific identifier
    messages=[{"role": "user", "content": "[YOUR_PROMPT]"}]
)

The DeepSeek V4 release introduces a more flexible interface that supports both OpenAI and Anthropic messaging formats. Note that the legacy names 'deepseek-chat' and 'deepseek-reasoner' will be retired on July 24, 2026.

Source

Change Log | DeepSeek API Docs
"the model parameter should be set to `deepseek-v4-pro` or `deepseek-v4-flash`."