DeepSeek V4: The Complete Developer Guide (API, Pricing, Local Setup & Migration 2026)
Dev.to AI
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Generative AI
Open Source AI
DeepSeek V4 is the hottest LLM story of 2026. GPT-4-class performance at 1/10th the price. OpenAI-compatible API. Open weights for self-hosting. And a July 24 endpoint deprecation deadline that many developers are quietly missing. This is the guide I wish existed when I started migrating our agent stack to DeepSeek. Let's cover everything. What is DeepSeek V4? DeepSeek V4 (API model: deepseek-chat ) is the flagship model from DeepSeek AI.