Run DeepSeek Harness on Step 5 Preview

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 Step 5 Preview

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

Step 5 Preview 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
Tencent Cloud	Multi		No	$1.00	$2.70

The model

Step 5 Preview from StepFun — text model on the Opper gateway.

Available on

Pricing from$1.00/ 1M input$2.70/ 1M output$0.05/ 1M cache read1Mcontext

Privacy

ZDR
Training: No
Region: Multi

More apps on Opper

Claude Code

Anthropic's terminal coding agent. Run it on any model on Opper, not just Claude.

Codingopper launch claude

Codex

OpenAI's open-source coding CLI. Run it on any model on Opper.

Codingopper launch codex

GitHub Copilot CLI

GitHub's terminal coding agent. Point its provider variables at Opper to run it on any model, no Copilot plan required.

CodingOpenAI-compatible