# DeepSeek — DeepSeek-V3.1 Release

- Company: DeepSeek (deepseek.com)
- Announced: 2025-08-21T00:00:00+00:00
- Category: model-update
- Subject: DeepSeek models
- Open weights: yes
- Models affected: DeepSeek-V3.1, DeepSeek-V3.1-Think, DeepSeek-V3.1-Base
- Context window: 128K context
- Pricing: New pricing starts & off-peak discounts end at Sep 5th, 2025, 16:00 (UTC Time)
- Source: https://www.deepseek.com/en/news/deepseek-v3-1
- Record: https://forck.live/items/4323-deepseek-v3-1-release

DeepSeek announces DeepSeek-V3.1, a model update with hybrid inference (Think & Non-Think), faster thinking, stronger agent skills, API updates with 128K context, open-source weights, and pricing changes.

## Evidence

Verbatim from https://www.deepseek.com/en/news/deepseek-v3-1:

> Introducing DeepSeek-V3.1: our first step toward the agent era!

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