Future-Proof Your Integration by Updating API Model Names to DeepSeek-V4
Switch your API model parameters to V4 names to prevent service interruption.
Update your API calls from legacy model names to 'deepseek-v4-pro' or 'deepseek-v4-flash' before the July 2026 deprecation deadline to ensure long-term stability.
The Scenario
You are an engineer or power user maintaining a script or application that uses the DeepSeek API and you want to ensure your integration remains stable past the upcoming deprecation deadline.
Before & after
Users continue using `deepseek-chat` or `deepseek-reasoner` without realizing these aliases will eventually break. In three months, their applications would fail, requiring 30-60 minutes of urgent troubleshooting.
Developers update their code to point to `deepseek-v4-pro` or `deepseek-v4-flash`, ensuring uninterrupted access to the latest capabilities. This update takes roughly 2 minutes.
The Prompt
In your application code or API configuration, update your model parameter: - Change `deepseek-chat` to `deepseek-v4-flash` - Change `deepseek-reasoner` to `deepseek-v4-pro` - Ensure your base_url is set to `https://api.deepseek.com/v1` (OpenAI compatible) or the Anthropic-compatible interface.
The DeepSeek API is transitioning to a V4 architecture. While the legacy names 'deepseek-chat' and 'deepseek-reasoner' currently function, they are scheduled for discontinuation on July 24, 2026. Explicitly switching to the new model names now avoids technical debt and ensures you are using the V4-Pro or V4-Flash versions intentionally.
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)."