# DeepSeek V3.1 Terminus

DeepSeek V3.1 Terminus is an AI model released by DeepSeek on Sep 22 2025. It has open weight.

## Facts

| Field | Value |
| --- | --- |
| Model | DeepSeek V3.1 Terminus |
| Developer | DeepSeek |
| Release date | Monday, Sep 22 2025 |
| Licensing | Open Weight |

## Questions and answers

### When was DeepSeek V3.1 Terminus released?

DeepSeek V3.1 Terminus was released by DeepSeek on Monday, Sep 22 2025.

### Who made DeepSeek V3.1 Terminus?

DeepSeek V3.1 Terminus was built by DeepSeek. Chinese AI lab known for efficient, open-weight models. Gained attention for strong performance at lower cost.

### Is DeepSeek V3.1 Terminus open source?

Partly. DeepSeek V3.1 Terminus is an open-weight model: the trained weights are free to download and run locally or on your own infrastructure, but the training data and code are not fully released and the license may restrict some commercial uses. It is not open source in the strict sense.

### What came before and after DeepSeek V3.1 Terminus?

DeepSeek's previous tracked release was DeepSeek V3.1 on Aug 21 2025, 32 days earlier. It was followed by DeepSeek V3.2 Exp on Sep 29 2025.


---

Canonical page: https://aireleasetracker.com/model/deepseek/deepseek-v3.1-terminus
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.