Best Open-Source Editor Agents for Developers Who Bring Their Own Model in 2026
Short answer: The best open-source editor agents for developers who bring their own model in 2026 is Cline. The default open-source agent: actively maintained, MCP marketplace, and runs in VS Code, JetBrains and the CLI. Runner-up: Kilo Code. Best free option: OpenCode.
BYOK agents inside VS Code and JetBrains.
#1 Pick
Cline
Runner-up
Kilo Code
Best free
OpenCode
All open-source editor agents compared
| Tool | Price / free tier | MCP | Open source / local | Verdict |
|---|---|---|---|---|
| Cline | Free (BYOK or pay-at-cost); ClinePass $9.99/mo for selected open models | Yes | Open source (Apache-2.0); local models via Ollama / LM Studio | The default open-source agent: actively maintained, MCP marketplace, and runs in VS Code, JetBrains and the CLI. |
| Kilo Code ⚠ Pricing and license not verified | Unverified | Yes | Unverified | Active fork with frequent releases. Note: it was acquired by Anaconda. |
| OpenCode | Free, open source | Unverified | Open source | Has an IDE extension as well as a TUI. A good escape hatch from Continue or Roo. |
| Continue ⚠ Not maintained | Free (BYOK); hosted Hub gone | Yes | Open source (Apache-2.0) | Frozen: read-only after Cursor acquired it. Local config still works, but don't start new projects on it. |
| Roo Code ⚠ Archived | Free (BYOK) | Yes | Open source | Archived (last push May 15, 2026). Listed only so you know to migrate away. |
"Unverified" means we couldn't confirm it on 2026-10-15. Picks are editorial and never sold.
FAQ
What is the best open-source editor agent in 2026?
Cline. The default open-source agent: actively maintained, MCP marketplace, and runs in VS Code, JetBrains and the CLI.
What is the best free option?
OpenCode: Free, open source
What is the runner-up?
Kilo Code. Active fork with frequent releases. Note: it was acquired by Anaconda.
How were these picks verified?
Prices and facts were checked against vendor pages or linked sources on 2026-10-15. Rankings are never sold.