GitHub Copilot, Cursor, and Windsurf: AI Coding Agents That Work Inside Your Editor

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A software developer has evaluated three AI coding agents — GitHub Copilot with GPT-5.6, Cursor, and Windsurf — that integrate directly into development environments rather than requiring manual copy-pasting from chat tools. Unlike simple autocomplete, these agents can read entire codebases, plan multi-file changes, execute terminal commands, and iterate based on test results. GitHub Copilot's new model variants (Sol, Terra, and Luna) cater to different task complexities, from deep architectural refactors to quick fixes, and are available across VS Code, JetBrains, and other platforms. Cursor, a VS Code fork, supports Claude Sonnet and OpenAI models with a free tier, while Windsurf is a ground-up editor that displays a visible step-by-step execution plan before acting on a codebase. All three tools aim to reduce context-switching between editors and chat interfaces, with each suited to different workflow needs and budget levels.

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