Future-Proof Your API Integration by Migrating to V4 Model Names
Switch your API calls to V4-Pro and V4-Flash now.
Future-proof your workflows by updating model parameters from legacy names to 'deepseek-v4-pro' or 'deepseek-v4-flash' before the July 2026 deadline.
The Scenario
You are maintaining a production application and want to ensure it doesn't break when legacy DeepSeek models are retired in mid-2026.
Before & after
Developers often leave legacy model names in their code for months, leading to sudden service breaks when endpoints are discontinued. Manual migration usually takes 30-60 minutes of debugging.
Update your API requests to call `deepseek-v4-flash` or `deepseek-v4-pro` to use the latest architecture immediately. This configuration takes about 5 minutes of dev time.
The Prompt
Update my configuration: base_url remains the same, but set model parameter to "deepseek-v4-pro" for high-performance reasoning or "deepseek-v4-flash" for speed.
The legacy names 'deepseek-chat' and 'deepseek-reasoner' will be discontinued on 2026-07-24. Moving to the V4 naming convention now ensures your application benefits from the newest Pro and Flash capabilities without interruption.
Source
Change Log | DeepSeek API Docs"The two legacy API model names... will be discontinued in three months (2026-07-24)."