What is an AI code editor (Cursor, Copilot, Devin Desktop, Zed)?

A code editor is the program where you write and organize code: it shows your files, colors the text so it is easier to read, and lets you run your project. An AI code editor adds a language model at three levels. Tab completion predicts the next few lines as you type. Chat answers questions about your code in a side panel. An agent takes a task, edits several files, runs commands and shows you the changes to accept or reject.

As of October 2026 the four names most people meet first are Cursor, GitHub Copilot, Devin Desktop and Zed. They overlap a lot, so the differences that matter are which models you can use, how usage is billed, and how much the tool pushes you toward letting the agent work alone.

The four, side by side

Prices are in US dollars per month as of October 2026.

Some details are worth knowing before you pick. Cursor's plans as of October 2026 are bundled with Grok and X features, and models from other companies are not included in the monthly price: they are charged on top at API rates, and not available at all on the $8 plan. Devin's plans refresh usage daily and weekly and let you buy more at API prices. Zed can be used with every AI feature switched off, which some learners prefer at first.

A worked example: the same small task in an editor

Say you have a small to-do app and want a "clear completed tasks" button. In any of these editors the flow looks similar:

1. Open the project folder in the editor.
2. Open the agent or chat panel and attach the relevant file.
3. Ask for a plan before any edits:

I want a "Clear completed" button that removes finished tasks from the list.
Before changing anything, tell me which files you'll edit and why, in three
or four bullet points. Wait for my OK.

1. Approve the plan, then read the proposed changes, shown as a diff (old lines in red, new lines in green), file by file.
2. Run the app and click the new button yourself before accepting.

The editor makes step 4 easy, which is its main advantage over copying code from a chat window: you see exactly what changed, in context, and can reject a single change.

Which one fits a learner, and which a professional?

For a learner, the best editor is one that keeps you reading code and costs little while you find your feet. Copilot's free tier inside VS Code is a gentle start: VS Code is free and appears in countless tutorials, so what you see will match what you read, and 2,000 completions a month plus limited chat goes a long way at a learner's pace. Zed's free plan suits learners who want a quick, uncluttered editor and are willing to set up an API key or connect an agent they already pay for. Whatever you choose, use chat to ask "why?" and accept agent changes only after you can explain them.

For a professional, the questions shift to model choice, team controls and cost at heavy use. Copilot offers a wide model list and fits naturally if your team already lives on GitHub. Cursor appeals to people who want the agent at the center of the editor, but check whether its Grok bundle suits you and budget separately for other models. Devin Desktop makes sense if you also want a cloud agent that takes whole tickets, since one plan covers both. Zed's Business plan adds org-wide AI controls and lets teams bring their existing AI contracts.

Many professionals pair an editor with a terminal agent such as Claude Code or Codex rather than relying on one tool. Whatever the mix, try two options on the same real task for a week before committing to an annual plan; the right choice is usually obvious once you have reviewed a few of each tool's diffs.