OpenCode

CLI Required

Go-based AI coding agent with self-contained ACP support. Lightweight, fast startup, and works with various open and commercial models.

INSTALLATION

1. Install OpenCode

npm install -g opencode-ai

2. Configure a provider

OpenCode supports multiple providers. Set the API key for your preferred provider:

# Anthropic

export ANTHROPIC_API_KEY=your-key

# OpenAI

export OPENAI_API_KEY=your-key

# Google

export GEMINI_API_KEY=your-key

3. Verify installation

opencode --version

SUPPORTED_MODELS

OpenCode routes to the model provider configured via environment variables. Compatible models include:

Claude (via Anthropic)Sonnet 4, Opus 4

GPT-4 (via OpenAI)GPT-4, GPT-4 Turbo

Gemini (via Google)Gemini 2.5 Pro, Gemini 2.5 Flash

Open models (via Ollama)Llama, Mistral, CodeGemma, etc.

FEATURES

- Self-contained ACP -- ACP support is built into the binary. No adapter needed.

- Fast startup -- Written in Go, starts almost instantly compared to Node.js-based agents.

- Multi-provider -- Switch between Anthropic, OpenAI, Google, or local models by changing environment variables.

- Local models -- Works with Ollama for fully offline operation.

REQUIREMENTS

- Node.js 18+ (for npm global install)

- At least one provider API key, or Ollama for local models