Cline
Cline is an open-source IDE plug-in for AI-assisted coding, built by Cline (open source community) (released 2024-01). Cline integrates with 2 verified models, including Claude Sonnet 4.6 and Claude Opus 4.6. It's free and open source. It runs as an extension in VS Code and JetBrains IDEs, pairing editor context with chat, completions, multi-file edits, and code review workflows for daily development.
Overview
Open-source VS Code extension that gives Claude or other LLMs autonomous access to the terminal, filesystem, and browser to complete complex coding tasks.
Featured Model Specs
| Model | Lab | Released | Context | Reasoning | Open source |
|---|---|---|---|---|---|
| Claude Sonnet 4.6 | Anthropic | 2026-02-17 | 1M | Yes | No |
| Claude Opus 4.6 | Anthropic | 2026-02-05 | 1M | Yes | No |
Model Compatibility Matrix
| Model | Lab | Default | Access tier | Notes |
|---|---|---|---|---|
| Claude Sonnet 4.6 | Anthropic | Yes | Pro | — |
| Claude Opus 4.6 | Anthropic | No | Pro | — |
Underlying Models
Compare to Similar Harnesses
FAQ
What is Cline?
Cline is an open-source IDE plug-in for AI-assisted coding, built by Cline (open source community) (released 2024-01). It runs as an extension in VS Code and JetBrains IDEs, pairing editor context with chat, completions, multi-file edits, and code review workflows for daily development. It is primarily used for pair programming, code review, and repository-aware edits inside an editor.
What models does Cline support?
Cline runs Claude Sonnet 4.6, Claude Opus 4.6.
How much does Cline cost?
Cline is free and open source. You pay only for the underlying model API usage.
Is Cline open source?
Yes, Cline is open-source software.
What are alternatives to Cline?
Alternatives include Zed, JetBrains AI Assistant, and Sourcegraph Cody.
When was Cline released?
Cline was released in 2024-01.