Run DeepSeek Harness on GLM-5.3

Name: DeepSeek Harness
Author: DeepSeek

by DeepSeekCoding agent

DeepSeek Harness (dsh) is DeepSeek's open-source agent harness, released under MIT and built so that everything is a plugin, from the model adapter and the tool registry to the agent loop itself. Start it with npx @deepseek-ai/dsh web and it opens a local web UI where the agent reads and edits your workspace, runs commands, and keeps a plan, with a headless profile for one-shot jobs from the terminal. On Opper it runs on any of 700+ models rather than DeepSeek's own alone: add Opper as a custom provider and you get one key, automatic fallbacks, and a choice of region.

Run

DeepSeek Harnessonin

Connect DeepSeek Harness to GLM-5.3

Set up with agents

Paste this into your coding agent (Claude Code, Cursor, Codex, and more) and it will set up and build with Opper for you.

Get your API key

Where you can run it

GLM-5.3 runs on the routes below. Route only to EU providers when your data has to stay in Europe.

Provider	Region	Zero data retention	Training	Input	Output
Melious	EU	Zero data retention	No	$1.16	$4.63
TensorX	EU	Zero data retention	No	$1.75	$4.50
Novita	US	Zero data retention	No	$1.40	$4.40

The model

GLM-5.3

by Z.ai

GLM-5.3 is Z.ai's flagship coding and agentic model, post-trained on the GLM-5.2 base (753B MoE): 1M-token context, 128K output, text-only, reasoning always on with a low/high/max effort ladder.