OpenCode

What it is for

OpenCode is an MIT coding agent with a terminal UI, desktop app, and IDE extension: you start a session, it greps the repo, reads files, and applies a change. Use it when the job is an open-source agent you run locally.

The software is $0. Free models ship in the box. Optional Go and Zen add paid model access. The cover is the official docs TUI still — a homepage-button session with grep, reads, and a Claude Opus build.

What makes it unique: one MIT binary that talks to 75+ providers (or GitHub Copilot / ChatGPT / Claude seats you already pay for).

Key features

• Session — prompt, grep/read, and a live build line in one agent loop (cover).
• Build / Plan — Tab-switch primary agents; Plan analyzes and writes under ~/.opencode/plan/ without editing the repo (docs).
• Subagents — @mention General, Explore, or Scout; child sessions for parallel research.
• MCP — add local or remote MCP servers so those tools sit next to the built-ins (opencode mcp add).
• LSP — feed language-server diagnostics back into the agent when you set "lsp": true (docs).
• Custom agents — define extra agents in opencode.json or .opencode/agents/*.md.

Who it's for

Best fit: developers who want a local MIT agent and will connect a provider or use the included free models.

Pricing

Verified 2026-10-22 (Asia/Shanghai) from opencode.ai, opencode.ai/docs/go, and opencode.ai/zen.

• OpenCode app — $0. MIT. Free models included.
• Go — $10/month. Curated open coding models with a monthly allowance.
• Go Plus — $40/month. Higher usage on the same Go lineup.
• Zen — pay-as-you-go. Add a $20 balance (card fee $1.23); auto-top-up another $20 when the balance hits $5. Per-1M-token rates are on the Zen docs table.

The homepage states the agent itself is free to use; connected providers bill their own usage.

Limitations / costs

• $0 is the agent. Frontier models you attach still bill that provider.
• Go and Zen are optional model routes, separate from the MIT binary.
• Cover is the official docs TUI still of a real session.
• Zen prints token rates, plus the $20 top-up.

Alternatives

• Aider — git-native TUI; Apache-2.0 $0.
• Goose — Block desktop/CLI; Apache-2.0 $0.
• Claude Code — Anthropic repo agent on Pro $20.

Official tutorial

Written OpenCode intro plus Go and Zen.

Website

https://opencode.ai

Repository

https://github.com/sst/opencode

Source

Catalog row curated for AI Tools Nav. Cover is the official OpenCode docs TUI still (session + grep/read). Software $0 MIT; Go $10; Go Plus $40; Zen $20 top-up. Dollars checked on opencode.ai, /docs/go, and /zen.

Last verified

2026-10-22 (Asia/Shanghai) editorial check.