Future-Proof Your Integrations by Migrating to V4 Model Names
Transition to V4-specific model names to ensure future service stability.
Update your API model parameters to 'deepseek-v4-pro' or 'deepseek-v4-flash' ahead of the July 2026 sunset of legacy model names.
The Scenario
You are maintaining a production application that relies on DeepSeek and want to avoid the upcoming end-of-life for legacy model names.
Before & after
Relying on legacy model names like 'deepseek-chat' will lead to unexpected service interruptions after the 2026-07-24 deadline, causing hours of troubleshooting.
Update your integration to use 'deepseek-v4-flash' or 'deepseek-v4-pro' to inherit the latest architecture and extended support. This migration takes roughly 5 minutes.
The Prompt
// Migration: Update your model parameter to the new V4 standard
model: "deepseek-v4-pro",
messages: [
{"role": "user", "content": "Analyze these requirements and suggest an architecture for [PASTE_PROJECT_DETAILS]"}
]DeepSeek is transitioning to V4. While old names currently point to V4-Flash, developers should proactively switch to v4-pro or v4-flash to ensure long-term stability and access to the newest features.
Source
Change Log | DeepSeek API Docs"legacy API model names... will be discontinued in three months (2026-07-24)."