Why OpenCode Is a Powerful Open‑Source Alternative to Claude Code
OpenCode is an open‑source AI coding assistant with over 170k GitHub stars that supports 75+ models, dual Plan/Build agents, and cross‑platform terminals, offering a detailed installation guide, CLI commands, and a full‑stack project demo that highlights both its strengths and current limitations.
OpenCode Overview
OpenCode is an open‑source AI coding agent that can understand project context, generate a development plan, and modify code autonomously. The GitHub repository has 170k+ stars.
Open source security : MIT license, zero data‑retention.
Multi‑model support : compatible with 75+ models (Claude, GPT, etc.), local Ollama, and built‑in free models.
Dual‑agent mode : Plan (read‑only analysis) and Build (code modification).
Protocol integration : LSP for static analysis; MCP (Model Context Protocol) for extensible services.
Cross‑platform terminal : TUI core plus desktop and IDE extensions.
Installation and Configuration
Install Node.js, then run: npm install -g opencode-ai Verify installation: opencode --version Run inside a project directory:
cd your-project
opencodeSwitch built‑in models with the /models command (mouse selection supported). To connect a custom model, use /connect, e.g., for DeepSeek: search “DeepSeek”, enter the API key, then select the model with /models.
Usage Example – Microsoft To Do‑style Application
Develop a front‑end/back‑end project similar to Microsoft To Do.
Toggle between Plan and Build agents with the Tab key; different agents can use different models.
Prompt: “I want to develop a Microsoft To Do web application.” OpenCode asks clarifying questions, starting with technology‑stack selection.
Database selection is performed via mouse‑driven CLI.
Core feature set is chosen (medium‑level).
OpenCode generates a detailed plan covering architecture, database schema, REST API endpoints, and front‑end components.
After confirming the plan, OpenCode writes highlighted code, iterates, and completes the project.
When the terminal window is wide enough, a right‑hand sidebar displays contextual information.
An additional requirement for dark/light theme switching was added later and implemented successfully.
Built‑in Commands
Slash‑prefixed commands include /models, /connect, and many others (see in‑app command table). Press ctrl+p to list non‑slash commands.
Limitations
OpenCode does not support background‑shell execution; long‑running services block the process unless the optional opencode-pty package is installed.
Project URL
https://github.com/anomalyco/opencode
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Su San Talks Tech
Su San, former staff at several leading tech companies, is a top creator on Juejin and a premium creator on CSDN, and runs the free coding practice site www.susan.net.cn.
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