Future-Proof Your Integration by Migrating to DeepSeek-V4 Endpoints
Switch to V4-Pro or V4-Flash before the July 2026 legacy sunset.
Update your API implementation to use 'deepseek-v4-pro' or 'deepseek-v4-flash' to avoid service interruptions when legacy model names are phased out.
The Scenario
You are maintaining a production application that relies on DeepSeek's API and need to ensure it doesn't break when legacy model names are discontinued in mid-2026.
Before & after
Developers manually monitor legacy endpoints and rewrite API integration logic every few months to ensure service continuity. This tracking and refactoring usually takes 2-3 hours per service.
Developers update the 'model' parameter to 'deepseek-v4-pro' or 'deepseek-v4-flash' in their code. This configuration update takes roughly 2 minutes.
The Prompt
Update my current DeepSeek API integration script to use the new V4 models. Change the model parameter from [OLD_MODEL_NAME] to 'deepseek-v4-pro' and ensure the base URL is consistent with the latest documentation.
The V4 release introduces a more powerful Pro version and a speed-optimized Flash version. Importantly, the legacy 'deepseek-chat' and 'deepseek-reasoner' names will expire on July 24, 2026. Transitioning now ensures your application benefits from the improved architecture before the sunset date.
Source
Change Log | DeepSeek API Docs"The DeepSeek API now supports V4-Pro and V4-Flash... the model parameter should be set to `deepseek-v4-pro` or `deepseek-v4-flash`."