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DeepSeek-V4 Preview: Entering the Era of Affordable Million-Token Context

DeepSeek announces the preview release of DeepSeek-V4, including two models: V4-Pro (1.6T total / 49B active params) and V4-Flash (284B total / 13B active params), both open-sourced with a default 1M context window. The models feature enhanced agentic capabilities, world-class reasoning, and structural innovations for long-context efficiency. The API is updated and available today, and the older deepseek-chat and deepseek-reasoner models will be retired after July 24, 2026.

From the source

DeepSeek-V4 Preview is officially live & open-sourced! Welcome to the era of cost-effective 1M context length.

deepseek.com

Announced

24 Apr 2026 00:00 UTC

Detected

21 Aug 2026 18:50 UTC (+119d after)