OpenCode

What is OpenCode?

OpenCode is an open-source AI coding agent. It runs as a terminal-based interface, desktop app, or IDE extension and connects to large-language-model providers configured by the user.

The agent can inspect a project, create an implementation plan, edit files, answer questions, and iterate as the developer provides feedback. Its documentation emphasizes provider choice rather than a single mandatory hosted model.

Because the agent itself is open source, it is classified as free software. Model-provider usage may still cost money, so the total cost depends on the provider and plan configured by the developer.

Key Features

Multiple interfaces

Use OpenCode from a terminal, desktop application, or IDE extension. This lets developers keep the agent close to their existing workflow.

Provider configuration

Users configure API keys for their chosen model providers. This separates the agent from a single vendor’s subscription and lets teams control model access.

Project context

OpenCode initializes configuration for a repository and uses project structure and coding patterns when planning or editing files.

Plan-first workflow

Developers can ask for a plan, provide feedback, and then switch to implementation. This is useful for non-trivial changes where review before editing matters.

How to Use OpenCode

1. Install OpenCode for your terminal, desktop, or IDE environment.
2. Configure an API key for a supported model provider.
3. Open a repository and initialize OpenCode configuration.
4. Ask a question or request a plan, review the proposal, and provide corrections.
5. Let OpenCode edit files, inspect the diff, test the result, and iterate.

Use Cases & Who It's For

• Software engineers: Delegate focused code changes while reviewing every diff.
• Open-source maintainers: Explore unfamiliar code and draft patches.
• Teams with model policies: Choose provider credentials instead of adopting a fixed managed account.
• Pair-programming workflows: Use plan mode before implementing complex refactors.

Pricing & Free Plan

OpenCode is classified as free because the official documentation describes it as an open-source AI coding agent. There is no OpenCode subscription fee in the reviewed documentation.

Users must separately arrange model-provider access. Provider API keys can have their own charges, rate limits, and billing terms. Windows installation through Bun was documented as in progress at review time, so users should check current platform support before installing.

Strengths & Limitations

Strengths

• Open-source agent with terminal, desktop, and IDE interfaces.
• Users can select and configure their own model providers.
• Plan-first workflow supports review before code changes.
• Good fit for repository-local development tasks.

Limitations

• Model-provider usage may incur separate costs.
• Users must manage API keys and provider compatibility.
• Automated changes still require tests and code review.
• Platform support and installation details can change; Windows setup had documented limitations during review.

Alternatives & When to Choose It

Compare OpenCode with hosted AI coding assistants when a managed subscription is simpler, and with other open-source coding agents when local control or provider portability is the priority. Choose OpenCode when you want an open-source, repository-aware agent and already have a preferred model provider.

Frequently Asked Questions

Is OpenCode free?

The agent is open source. Model-provider inference may still cost money depending on the API key and plan you configure.

Where does OpenCode run?

Documentation lists a terminal interface, desktop app, and IDE extension.

Do I need an API key?

Yes. OpenCode uses API keys for the model providers you want to access.

Can it change files automatically?

It can propose and edit files, but developers should review diffs and run tests before merging.

Sources & Verification

• Official website: OpenCode
• Documentation: OpenCode docs
• Last checked: 2026-09-21
• Verification: Official homepage and pricing, plans, or documentation were archived and reviewed. Public page availability and metadata were checked; no paid purchase, subscription, or account-specific workflow was performed unless explicitly stated. Rankings and traffic metrics from seo.box are directory context, not product-quality evidence.