# DeepSeek Launches DeepSeek-V4 Preview

- Category: Flash (快讯)
- Published: 2026-04-24T12:00:00.000Z
- Source date: 2026-04-24
- HTML: https://www.88z.ai/en/news/flash-20260424-ef8150a16183bf80
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DeepSeek has released and open-sourced the preview of DeepSeek-V4, featuring Pro and Flash variants that both support a 1M context window. The Pro version matches top closed-source models in performance, while the Flash version offers similar reasoning capabilities at a lower cost. The new architecture significantly reduces computation and memory overhead for long contexts.

## At a glance

- DeepSeek-V4 preview is open-sourced with Pro and Flash versions supporting 1M context
- New architecture uses DSA sparse attention to significantly reduce long-text computation and memory costs

## The update

DeepSeek has officially launched the preview version of its new DeepSeek-V4 model series, releasing it as open source simultaneously. The release includes two specific variants, deepseek-v4-pro and deepseek-v4-flash, both of which support a 1M ultra-long context window. The V4-Pro matches top-tier closed-source models in agent coding, world knowledge, and reasoning performance, while the V4-Flash aims to provide comparable reasoning capabilities at a lower cost. Technically, the series adopts a new attention mechanism combined with DSA sparse attention, significantly reducing computational complexity and memory usage for long-context processing.

## Sources

- [DeepSeek](https://mp.weixin.qq.com/s/8bxXqS2R8Fx5-1TLDBiEDg) (2026-04-24)

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