Choose the install path
Windows x64 and Apple Silicon: use the official Desktop preview. Intel Mac and Linux: use the npm/npx Web UI path.
Independent DeepSeek Harness guides
Install DeepSeek Harness, fix errors, then extend the workflow
Start with the shortest setup path for your operating system. Once DSH can access an empty test workspace, use the guides below for model configuration, error fixes, plugins and model selection.
Published baseline0.1.5-rc.1
Source snapshot0.1.5-rc.2 · c291e79
Verified2026-09-11
Project stageDeveloper preview · breaking changes are possible
Get to a working first session
Do not learn the whole toolchain before checking the basic path.
Configure a model
Save a provider credential in Settings → Models and select a model from the live picker.
Verify an empty workspace
Use a disposable dsh-test folder and run a read-only file-listing task before asking DSH to edit anything.
DSH Desktop for Windows and macOSUse the packaged desktop app if you do not need a CLI-first setup
Download the official DeepSeek Harness Desktop preview for Windows x64 or Apple Silicon Mac. Model API credits are not included.
Check Desktop compatibility and setup →Install for your operating system
Each guide ends with the same success check: DSH opens, the model replies and the selected test folder is correct.
Windows
Use DSH Desktop first. The CLI path remains available in the advanced section.
Open the Windows guide →
macOS
Use the official Apple Silicon DMG; Intel Mac users can follow the CLI setup.
Open the macOS guide →
Go straight to the problem you have
Installation, configuration, extensions and model choice are separate layers. Fix the layer that is actually failing.
Model will not connect
Check the provider credential, selected model and custom-provider settings.
Open model configuration →
Need another capability
Review plugins, MCP and provider extensions only after the base session works.
Browse extensions →
Choosing a model or routing policy
Compare price, context, benchmark evidence and accepted-task cost instead of relying on one leaderboard.
Open model analysis →Common DSH errors
Use the exact error message when one is available.
MISSING_CREDENTIALNo usable API credential is saved for the current provider.UNKNOWN_MODELThe selected model is not available under the configured provider.401 authentication failedThe provider rejected the credential used for this request.EADDRINUSE / EACCES :3080The local Web UI port is occupied or reserved by Windows.Select model / input disabledA provider, model or workspace still needs to be selected.See the workflow before you change a real project
Choose a test folder, select a model, review approvals and verify the result on disk.
Model comparison
Compare DeepSeek V4.1 Flash, GPT-6 Astra, Claude Fable 5.1 and Gemini 3.8 Flash with evidence boundaries kept visible.
Open Models →Benchmark literacy
Check benchmark version, harness, tool permissions and reasoning effort before comparing two scores.
Read the benchmark guide →Source and release checks
Use release pages and pinned source links when DSH behavior changes between developer-preview builds.
Open version sources →