Best for autonomous, feature-sized work by terminal-comfortable developers
Claude Code is the most autonomous mainstream option: a terminal-first agent that reads a codebase, plans, edits across many files, runs tests and iterates. It rewards developers who write precise instructions and frustrates those who want autocomplete.
Best overall AI editor for developers who work in a GUI
Cursor is a VS Code fork with AI designed in rather than bolted on. Its codebase indexing and multi-file editing are the best-integrated in a graphical editor, and it is the most common answer when developers are asked what they actually pay for.
Best free agent, and the most transparent one for reviewing every step
Cline is a VS Code extension that gives you agent-level capability without a subscription: you supply an API key, it supplies the agent. The permission-per-step design makes it the most transparent agent we tested, and the most reviewable.