DeepSeek Harness
DeepSeek's MIT-licensed agent harness, a developer preview built on a 'everything is a plugin' Cordis kernel, launched the same day as DeepSeek V4-Pro on the API.
| Vendor | DeepSeek |
|---|---|
| Form | Open-source agent harness (CLI dsh + local web UI) |
| Launched | August 13, 2026 (developer preview) |
| ARscore | not scored |
| Pricing tier | Free (MIT); pay-per-token API |
| Coding models | Provider-agnostic: DeepSeek, Anthropic, OpenAI, Bedrock, Vertex, Azure, custom |
| Open source | Yes (MIT) |
Official links
Outbound, for trial and verification.
| Official site | https://github.com/deepseek-ai/deepseek-harness |
|---|---|
| Pricing | https://platform.deepseek.com/ |
| English interface / changelog | https://github.com/deepseek-ai/deepseek-harness |
Capabilities
What it ships, in its own terms.
The model adapter, tool registry, session log and even the agent loop are swappable plugins; a local web UI runs at 127.0.0.1:3080 via npx @deepseek-ai/dsh web, with profile and headless CLI modes. It is not locked to DeepSeek models.
Use cases
Scenario coverage (presence, not benchmark performance).
| Scenario | Local files | Docs / PPT | Excel reports | Analysis | Web search | Mini-programs | Web building |
|---|---|---|---|---|---|---|---|
| DeepSeek Harness | ✓ | — | — | — | — | — | ✓ |
✓ supported · ◐ partial or via a sibling product · ? unclear · — not in scope. Presence, not benchmark performance.
Users
Subscriber and active-user counts, source-labelled.
~169K GitHub stars and 18.1K forks one week after release — Source: Marketplace (GitHub)
Third-party review
Independent coverage, not vendor marketing.
Third-party editorial: no editorial score; V4-Pro self-reported DeepSWE +49.9 / Cybergym +30.6 (vendor, not reproduced)
Coding ability (benchmark): not scored — no DeepSWE or Terminal-Bench measurement.
VentureBeat called it 'an open-source rival to Claude Code'; the README warns of compatibility-breaking changes. V4-Pro's self-reported DeepSWE (+49.9) and Cybergym (+30.6) gains are vendor figures, not independently reproduced.
Source: Press (VentureBeat) / Vendor-reported
Compare further
The reference agents and the scored Chinese entry.