Upgrade to DeepSeek V4 API Model Endpoints Immediately
Update your API model parameters to avoid service interruption.
Transition your API integrations from legacy model names to 'deepseek-v4-pro' or 'deepseek-v4-flash' before the July 24, 2026 deadline.
The Scenario
You are maintaining a project that uses DeepSeek's API and need to ensure your integration doesn't break when legacy model names are discontinued.
Before & after
Developers manually maintain legacy model endpoints like `deepseek-chat` or `reasoner`, often requiring 30-60 mins of auditing across multiple repositories before sunset dates.
Update your code to call `deepseek-v4-pro` or `deepseek-v4-flash`; the task takes just 2-5 minutes depending on your codebase size.
The Prompt
Search my codebase for 'deepseek-chat' or 'deepseek-reasoner' and replace them with '[deepseek-v4-pro OR deepseek-v4-flash]' to ensure compatibility before the July 2026 sunset.
DeepSeek has introduced V4 model names and scheduled the discontinuation of legacy names for July 2026. This transition is critical for developers using the API to maintain service continuity.
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)."