Why OpenCode Is the Open‑Source Alternative to Claude Code for AI‑Powered Programming

OpenCode Overview

OpenCode is an open‑source AI coding agent that can understand project context, plan tasks, and modify code autonomously. It has accumulated more than 170k+ stars on GitHub.

Open‑source security : MIT license, zero data‑retention policy.

Multi‑model support : compatible with 75+ models (Claude, GPT, local Ollama) and includes free built‑in models.

Dual‑agent mode : Plan (read‑only analysis) and Build (code modification and refactoring).

Protocol integration : LSP provides static analysis for generated code; MCP allows extending AI capabilities.

Cross‑platform terminals : core TUI, desktop apps, and major IDE extensions.

Installation & Configuration

After installing Node.js, run: npm install -g opencode-ai Verify the installation: opencode --version Start the agent inside a project directory:

cd your-project
opencode

Switch between built‑in free models with /models (mouse‑selectable). To use a custom model, configure it with /connect. Example for DeepSeek:

Search for “DeepSeek” in the CLI.

Enter the API key.

Select the configured model via /models.

Practical Usage Example

Developing a Microsoft To Do‑style web application.

Toggle between Plan and Build modes with the Tab key; each mode can use a different model.

Prompt (Chinese):

我想开发一个类似Microsoft To Do的Web应用

The CLI asks clarification questions about the technology stack, database choice, and core features. After confirming requirements, OpenCode generates a detailed plan that includes architecture, database schema, REST API endpoints, and front‑end components. Generated code is syntax‑highlighted.

When the window is widened, a side‑bar displays contextual information. Additional requirements such as dark‑mode support can be added later, and the final UI is shown in the screenshots.

Built‑in Commands

Beyond /models and /connect, OpenCode provides many slash‑prefixed commands (see the tool’s help table). Press ctrl+p to view non‑slash commands.

Limitations

OpenCode does not provide a background shell; long‑running services block the process unless the optional opencode-pty plugin is installed, making some workflows less mature than Claude Code.

Project Repository

https://github.com/anomalyco/opencode