Best for · verified Nov 2, 2026

Best open-source coding agent

You want to read the code, pick any model, and avoid lock-in.

Short answer: OpenCode. Free models included; any provider.

  1. OpenCode

    Free models included; any provider.

    Free tier: Yes. "100% free to use", including free models usable without an account.
    Paid: None. You pay only if you connect a paid provider.

  2. Cline

    Editor extension, bring your own key.

    Free tier: Yes. The extension is free for individual developers.
    Paid: Pay only for AI inference, usage-based. No subscription required.

  3. Aider

    Terminal pair programmer with automatic git commits.

    Free tier: Yes. Free and open source; you pay for whichever model you connect.
    Paid: None. Model costs only.

  4. Goose

    Extensible, Apache-2.0, any LLM.

    Free tier: Yes. Apache-2.0 open source.
    Paid: None. Model costs only.

FAQ

What is the best open-source coding agent?

Our top pick is OpenCode: Free models included; any provider.

Why consider Cline?

Editor extension, bring your own key.

Why consider Aider?

Terminal pair programmer with automatic git commits.

Why consider Goose?

Extensible, Apache-2.0, any LLM.