Comparing AI coding assistants: Claude Code, Cline, and OpenCode

I have spent significant time with three AI coding assistants: Claude Code, Cline, and OpenCode. They approach the same problem differently, and which one works best depends on how you like to work.

Claude Code

Claude Code runs in the terminal. You open a project, start a conversation, and it reads your codebase, suggests changes, creates files, runs commands, and iterates based on feedback. It is agentic: you describe what you want and it figures out the steps.

What it does well: Complex, multi-file tasks. "Refactor this service into three modules" or "add authentication to this API" are the kinds of requests where Claude Code shines. It understands project structure, follows conventions in your codebase, and can make coordinated changes across many files.

The MCP ecosystem is a big differentiator. You can connect Claude Code to external tools (databases, APIs, documentation) through MCP servers, which gives it context that other assistants do not have.

Where it is less ideal: Quick inline edits. If you just want to autocomplete a function, opening a terminal conversation is more friction than an inline suggestion. It is built for substantial work, not quick fixes.

Cline

Cline is an open-source VS Code extension that turns your editor into an agentic coding environment. Originally called Claude Dev, it grew into a full-featured agent that can read your project files, make changes, run terminal commands, and iterate on results. All from inside VS Code.

I tried Cursor briefly before landing on Cline. Cursor is a solid editor, but switching to a VS Code fork felt unnecessary when I could get agentic features as an extension in the editor I already used. Cline kept me in my existing setup.

What it does well: Agentic work inside the IDE. You give it a task and it figures out which files to read, what changes to make, and what commands to run. The Plan/Act mode split is useful. Plan mode lets the agent think through an approach before touching anything. Act mode executes. The approval step for each action gives you control over what it does.

Where it is less ideal: The approval flow slows things down on larger tasks. Every file read, every command, every edit needs a click. For a task that touches ten files and runs tests twice, that is a lot of clicking. And you can only run one agent at a time in one VS Code window. No parallel execution.

OpenCode

OpenCode is an open-source terminal-based assistant. It supports multiple model providers (OpenAI, Anthropic, local models via Ollama) and focuses on transparency. You can see exactly what context it sends to the model and what tools it uses.

What it does well: Provider flexibility. If you want to use local models for some tasks and cloud models for others, OpenCode makes that easy. The open-source nature means you can inspect and modify the tool itself.

Where it is less ideal: The feature set is smaller than Claude Code or Cline. It is a solid tool but does not have the depth of integrations or the polish of some alternatives.

How I use them

My daily workflow combines two of these:

Claude Code for substantial work. When I am building features, refactoring, or working on anything that touches multiple files, I use Claude Code. The agentic approach means I can describe the goal and let it work through the implementation.

Cline for IDE-integrated work. When I want the agent to work inside VS Code where I can see the diffs visually and approve each step, Cline is my go-to. It is especially useful for tasks where I want tighter control over what the agent does.

I use OpenCode occasionally when I want to test prompts against local models or when I want full control over the model provider.

The cost

Claude Code requires a Claude subscription. Cline is free and open-source, but you bring your own API keys (or use local models). OpenCode is also free and you bring your own API keys or local models.

For professional development work, the paid tools pay for themselves quickly. The time savings from even a few assisted refactors per week exceeds the subscription cost.

Which one to try first

If you live in VS Code: start with Cline. It adds agentic capabilities without leaving your editor.

If you live in the terminal: start with Claude Code. The agentic workflow is powerful.

If you want open-source and provider flexibility: start with OpenCode.

There is no single best tool. The right choice depends on your editor preference, workflow style, and how you think about AI assistance.

Sources

• Claude Code
• Cline
• OpenCode