OpenCode Review (2026)
The open-source, provider-agnostic AI coding agent that runs in your terminal and works with almost any model.
Technical Overview
OpenCode is an open-source AI coding agent built for the terminal. Rather than living inside one vendor's editor or subscription plan, it runs as a fast terminal interface and command-line tool on your own machine: it reads your project, plans changes, edits files, runs shell commands, and iterates on the errors it meets — the agentic loop that made terminal agents famous, released under the MIT license.
Its defining trait is provider-agnosticism. OpenCode connects to dozens of model providers — Claude, the GPT family, Gemini, and many more — and can also drive local models through runtimes such as Ollama. You bring your own API keys, switch models per task, and keep configuration inside your repository.
Quick Start Command
curl -fsSL https://opencode.ai/install | bashAdvantages (Pros)
- ✓ Fully open source (MIT): audit it, fork it, or self-host it — no black box
- ✓ Provider-agnostic: Claude, GPT, Gemini, and local models behind one interface
- ✓ Plan and build modes keep exploration read-only until you approve changes
- ✓ LSP integration and undoable sessions built for real codebases
Considerations (Cons)
- ✗ You supply the model: quality and cost depend on your own API keys
- ✗ Younger, faster-moving ecosystem than the first-party vendor tools
- ✗ Terminal-first interface has a learning curve for GUI-only developers
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What is OpenCode best for?
OpenCode is best for developers who love the agentic terminal workflow but refuse to marry a single model vendor. A team can standardize on one agent interface while each developer picks the model that fits the task — Claude for a delicate refactor, a fast GPT model for boilerplate, a local model for code that cannot leave the building. It also shines where a first-party tool is unavailable or restricted by policy: if a provider exists, OpenCode can probably drive it.
Key features
- Provider-agnostic engine. Connect dozens of providers, or run fully local models, and switch mid-session.
- Plan and build modes. Plan mode explores read-only; build mode edits files and runs commands.
- LSP-aware editing. It queries language servers for definitions and diagnostics, so edits respect project semantics.
- Sessions, undo, and sharing. Work persists per project, rolls back step by step, and shares via a link.
- Custom agents. Define agents and subagents with their own prompts, models, and permissions.
OpenCode vs Claude Code
Claude Code and OpenCode attack the same problem — an agent inside your terminal — from opposite directions. Claude Code is Anthropic's first-party tool: tuned for Claude models, vendor-polished and supported, paid via subscription or Anthropic API billing. OpenCode is community open source: the workflow feels familiar, but the model is your choice, the code is auditable, and there is no subscription — you pay your provider directly, or nothing with local models. Claude loyalists often prefer the original; model-mixers and the cost- or compliance-constrained choose OpenCode.
Limitations to know
- You supply the model. Quality and cost depend on your own API keys; local models depend on your hardware.
- Younger ecosystem. Documentation and examples still trail the first-party vendor tools.
- Terminal-first. GUI-only developers face an initial adjustment period.
Frequently asked questions
Is OpenCode really free?
Yes — free and open source under the MIT license. You only pay for the models you connect, or nothing if you run local models.
Does OpenCode work with ChatGPT and Gemini?
Yes. It supports OpenAI's GPT models, Google Gemini, Anthropic Claude, many other providers, and local models, switchable per session or per agent.
Can OpenCode replace my IDE?
It complements it. OpenCode runs in any terminal — including your IDE's integrated one — and handles multi-file edits, commands, and test loops while you keep editing.