Future-Proof Your API Integration Before the July 2026 Legacy Discontinuation
Update your API model parameters to V4-Pro or V4-Flash now.
Switch your API requests from legacy chat/reasoner names to the specific 'deepseek-v4-pro' or 'deepseek-v4-flash' identifiers to avoid service disruption.
The Scenario
You are maintaining a custom AI application or script and need to ensure it doesn't break when DeepSeek retires its legacy API endpoints in July 2026.
Before & after
Developers often use generic 'chat' or 'reasoner' endpoints which are being phased out. Manually debugging a failed connection after a model is discontinued can take 30–60 minutes of troubleshooting and documentation reading.
Update your API scripts to use 'deepseek-v4-pro' or 'deepseek-v4-flash' immediately. This ensures your applications continue to function after the July deadline and gain access to the 1.6T parameter model architecture, taking only about 2 minutes to update configuration files.
The Prompt
Update your API call configuration: model: "deepseek-v4-pro" // or "deepseek-v4-flash" base_url: "https://api.deepseek.com"
The legacy names 'deepseek-chat' and 'deepseek-reasoner' will be discontinued on July 24, 2026. Transitioning now prevents service interruptions for your AI-powered apps.
Source
Change Log | DeepSeek API Docs"The two legacy API model names, deepseek-chat and deepseek-reasoner, will be discontinued in three months (2026-07-24)."