---
id: "b939"
language: "en"
library: "tools"
source_locale: "en"
source_market: "global"
official_url: "https://www.deepseek.com/harness/"
profile_updated_on: "2026-10-24"
---

# DeepSeek Harness

DeepSeek’s open-source agent client for working with files, running tools and composing custom workflows.

- Company / organization: DeepSeek (Hangzhou)
- Company country / region: China · Company registration
- Category: AI assistants & clients
- Official website: [https://www.deepseek.com/harness/](https://www.deepseek.com/harness/)
- Profile updated: 2026-10-24


## Overview

DeepSeek Harness connects models to a local workspace and execution tools for repository inspection, code changes, commands and document tasks. It offers a desktop app and a self-hosted web interface. Developers can compose models, tools and interfaces through Cordis plugins. This is an agent runtime and client; a model service must still be configured or accessed through an account.

## Usage guide & costs

### Before you start

Public preview; features and interfaces may change. Review file permissions and commands before execution. Official models follow platform billing; custom-model costs and data processing depend on the selected provider. A locally running interface does not imply offline inference.

[Official details](https://www.deepseek.com/harness/terms-of-use/)
[Official details](https://deepseek-harness.github.io/deepseek-harness/)


## Access options

### Visit website · AI assistants & clients

DeepSeek’s open-source agent client for working with files, running tools and composing custom workflows.

[Visit website](https://www.deepseek.com/harness/)

### Visit website · Agent development platforms

DeepSeek’s open-source agent client for working with files, running tools and composing custom workflows.

[Visit website](https://github.com/deepseek-ai/deepseek-harness)

## Official sources and references

- [Official website](https://www.deepseek.com/harness/)
- [Official website](https://github.com/deepseek-ai/deepseek-harness)
- [Documentation](https://deepseek-harness.github.io/deepseek-harness/)
- [Pricing source](https://api-docs.deepseek.com/quick_start/pricing)

## Related product news

### DeepSeek updates V4.1-Flash-1017

- Original publication date: 2026-10-17

DeepSeek upgrades its web, app and API to V4.1-Flash-1017, retaining the deepseek-flash model ID and pricing. The update targets reasoning and agent tasks, with optimizations for DeepSeek Harness, Tencent CodeBuddy and WorkBuddy.

[DeepSeek](https://api-docs.deepseek.com/updates#deepseek-v41-flash-1017-update)

## Company news

### DeepSeek opens its in-house search API

2026-10-17

DeepSeek opens Search / Fetch APIs for its own search engine, providing multilingual web search and page retrieval for models and agents.

[DeepSeek](https://api-docs.deepseek.com/updates#opening-up-the-in-house-search-api)

### DeepSeek releases V4.1-Flash

2026-09-10

DeepSeek releases V4.1-Flash with native visual understanding and an asymmetric MoE architecture aimed at reducing inference and cache costs. The multimodal API uses deepseek-flash; older Flash model IDs temporarily route to the new model.

[DeepSeek](https://www.deepseek.com/en/news/deepseek-v4-1-flash/)

## Reading & subscriptions

- [Interactive profile](../../../products/deepseek-harness--b939.html)
- [Read](../../../read/en/products/deepseek-harness--b939.html)
- [JSON](../../../read/en/products/deepseek-harness--b939.json)

Descriptions summarize public information; consult official websites for features, pricing and regional availability.