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

- Company: DeepSeek (deepseek.com)
- Announced: 2026-04-24T00:00:00+00:00
- Category: new-model
- Subject: DeepSeek models
- Open weights: yes
- Models affected: DeepSeek-V4-Pro, DeepSeek-V4-Flash, deepseek-chat, deepseek-reasoner
- License: open-sourced
- Context window: 1M context
- Source: https://www.deepseek.com/en/news/v4-preview
- Record: https://forck.live/items/4319-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.

## Evidence

Verbatim from https://www.deepseek.com/en/news/v4-preview:

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

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Record: https://forck.live/items/4319-deepseek-v4-preview-entering-the-era-of-affordable-million-token-context
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