Future-Proof Your API Integrations by Switching to V4 Model Names
Migrate legacy API calls to V4 Pro/Flash to avoid service disruptions.
Switch your API model parameters from legacy names to 'deepseek-v4-pro' or 'deepseek-v4-flash' before the July 2026 deadline.
The Scenario
You are a developer or power-user using the DeepSeek API and want to ensure your scripts don't break when legacy models are discontinued.
Before & after
Developers manually update local logic to handle model deprecations, often taking 1–2 hours to verify which new model replaces their old legacy tools.
Update your code or app configuration to 'deepseek-v4-pro' or 'deepseek-v4-flash' to use the latest architecture, taking approximately 2 minutes to update the environment variables.
The Prompt
I am currently using the DeepSeek legacy model names in my script. How do I update my code to use the new DeepSeek-V4-Pro endpoint while maintaining the OpenAI ChatCompletions interface? Show me the Python code snippet.
DeepSeek is discontinuing 'deepseek-chat' and 'deepseek-reasoner' legacy names on 2026-07-24. Switching to the V4 labels now ensures compatibility and access to optimized performance via both OpenAI and Anthropic compatible interfaces.
Source
Change Log | DeepSeek API Docs"The two legacy API model names... will be discontinued in three months. Use deepseek-v4-pro or deepseek-v4-flash."