What Is OpenCode? The Open-Source, Rust, Terminal-First Coding Agent | TeamoRouter

Quick Answer

OpenCode is an open-source, Rust-based, terminal-first, multi-model coding agent. You give it natural-language instructions in your terminal; it reads the repo, edits files, and runs commands, then shows you the diff for review. It does the same job as Claude Code and Codex — but its core selling points are minimalism, customizability, and zero model lock-in.

• One command to install, one opencode.json to configure a provider — install and go.
• Natively supports the OpenAI-compatible protocol, so hooking it to TeamoRouter (https://api.teamorouter.cn/v1) runs any of DeepSeek V4, Claude, or GPT.
• In one line vs Claude Code / Codex: Claude Code is the closed-source commercial benchmark, Codex is locked to the OpenAI ecosystem — OpenCode is open source, model-agnostic, and fully under your control.
• Who it's for: developers who want minimal, out-of-the-box, no vendor lock-in, and their own toolchain.

What OpenCode Is

OpenCode is an AI coding agent that runs in your terminal, built around "doing coding automation cleanly." Its keywords:

• Open source: the code is public — audit it, modify it, customize it.
• Written in Rust: fast startup, stable memory, a crisp terminal experience.
• Terminal-first: no fancy GUI; a terminal is all there is — which makes it a natural fit for servers, SSH remotes, and CI/CD environments.
• Multi-model: connect any model through an OpenAI-compatible provider — DeepSeek, Claude, GPT, Gemini — and switch freely, without being locked to any vendor.
• Active community: continuous iteration, mature provider and config ecosystem.

A typical session looks like this:

# give a command directly in the terminal
opencode "find and fix the memory leak in the request handler"

# or start an interactive session
opencode

OpenCode reads the repo, makes a plan, edits files, runs commands, then shows you the changes as a diff to review. That's the core workflow.

One-Line Differences vs Claude Code / Codex

• vs Claude Code: Claude Code is the mature commercial benchmark — the strongest reasoning depth and tool reliability, but closed source, runs on flagship models, and the bill adds up. OpenCode is open source, cheap, and fully controllable.
• vs Codex: Codex is tied to the OpenAI ecosystem (ChatGPT login, GPT models). OpenCode is an open-source tool that works with whichever model you configure — pick it if you don't want to be locked into the OpenAI orbit.

How to Install

OpenCode installs globally with one command:

# global install via npm (one of the official options)
npm install -g opencode-ai

# or the official install script
curl -fsSL https://opencode.ai/install | bash

Type opencode in your terminal and you're in. It works the same on headless servers and remote environments — that's the natural advantage of a terminal-first tool.

How to Connect It to TeamoRouter

OpenCode speaks the OpenAI-compatible protocol, so connecting TeamoRouter means adding one provider to opencode.json, pointing the base URL at https://api.teamorouter.cn/v1 and dropping in your sk-teamo- key:

{
  "provider": {
    "teamorouter": {
      "options": {
        "baseURL": "https://api.teamorouter.cn/v1",
        "apiKey": "sk-teamo-your-key"
      },
      "models": {
        "deepseek-v4-flash": { "name": "DeepSeek V4 Flash" },
        "deepseek-v4-pro": { "name": "DeepSeek V4 Pro" }
      }
    }
  }
}

Restart OpenCode after configuring and switch to the model you want in the model picker. Now you can:

• Run DeepSeek V4 Flash (about $0.14/$0.28 per million tokens) for high-frequency daily work — cheap enough to leave an agent running all day.
• Run DeepSeek V4 Pro for multi-file reasoning and hard problems.
• Switch to Claude / GPT any time — one key, unified billing, balance that never expires.

OpenCode vs dsh: Minimal vs Plugin Framework

OpenCode is often compared to DeepSeek Harness (dsh) — both are open-source coding agents, but the philosophies are opposites:

• OpenCode: minimal modularity, install and go, clear config — for people who want to be productive fast without learning a framework abstraction.
• dsh: everything is a plugin (Cordis), 54 npm packages, and the agent can even define plugins on the spot to rebuild itself — for people who want deep customization and to build their agent as a framework.
• Cost: both are model-agnostic; pointed at DeepSeek V4, both start at $0.14/$0.28.

In one line: want minimal and out-of-the-box, pick OpenCode; want extreme customizability, pick dsh. The full head-to-head is in DeepSeek Harness vs OpenCode.

Who OpenCode Is For

• Developers who want minimal, out-of-the-box tooling: once installed, it just is the tool — no framework abstraction to carry.
• Teams that don't want vendor lock-in: open source and multi-model — swap providers anytime.
• Terminal natives and server operators: SSH, remote, CI/CD — it works the same everywhere.
• Cost-sensitive, high-frequency agent users: hook DeepSeek V4 Flash and the $0.14/$0.28 price supports all-day agent sessions.

If you need "a framework with a deep plugin ecosystem that can rebuild itself," look at dsh. If you want "a simple, reliable terminal agent whose model I choose myself," OpenCode is the answer.

FAQ

Does OpenCode need a GUI?

No. It's terminal-first and fully usable on headless servers, SSH remotes, and CI/CD.

Can OpenCode connect to Claude / GPT?

Yes. It's model-agnostic — connect any model through an OpenAI-compatible provider. With one TeamoRouter key you can switch between DeepSeek V4, Claude, and GPT.

Which is stronger, OpenCode or Claude Code?

Different jobs. Claude Code's reasoning depth and tool reliability are the benchmark, but it's closed source and expensive. OpenCode is open source, cheap, and customizable. If you want the best single-shot quality per task, pick Claude Code; if you want control and cost, pick OpenCode.

How do I choose between OpenCode and dsh?

Minimal and out-of-the-box → OpenCode; deep customization → dsh. Pointed at DeepSeek V4 they're equally cheap, and one key can configure both, picking per task.

Is OpenCode free?

The tool itself is open source and free; the only cost is on the model side. Via TeamoRouter you can start with the deepseek-v4-flash-free / deepseek-v4-pro-free free tiers (200 requests each per day) before deciding to pay.

To run agents cheaply in OpenCode, register for TeamoRouter to get a key, configure opencode.json as above, and you're connected to DeepSeek V4 in about a minute.