Proactively Migrate Legacy Model Names to DeepSeek-V4
Update your model parameters to V4 early to avoid service interruptions.
Transition your API calls from legacy model names to the new 'deepseek-v4-pro' or 'deepseek-v4-flash' parameters before the July 2026 cutoff.
The Scenario
You are managing a production application and need to ensure your AI integration doesn't break when legacy models are retired.
Before & after
Developers would typically wait until an API stops working to update their code, leading to emergency fixes and hours of downtime.
Switching to 'deepseek-v4-pro' via the API allows you to maintain current functionality while benefiting from newer architecture. It takes about 2 minutes to update the string.
The Prompt
Review my current API implementation code and help me update model parameters from legacy names to deepseek-v4-pro: [PASTE_API_CODE]
The legacy model names 'deepseek-chat' and 'deepseek-reasoner' are being discontinued on July 24, 2026. Transitioning to the 'deepseek-v4-pro' or 'deepseek-v4-flash' names ensures your applications stay current.
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)."