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GitHub Copilot

Also known as: Copilot, GitHub Copilot X, Copilot Chat

Microsoft and GitHub's AI coding assistant, built into editors like VS Code. Originally focused on inline code completion (autocomplete at scale), it has expanded to include chat, multi-file edits, and an agent mode. Powered by OpenAI models.

GitHub Copilot was the first widely-deployed AI coding tool, launching in 2021 as a VS Code extension that suggested code completions as you typed. It popularized AI-assisted development and set the baseline expectation that AI could be a genuinely useful coding companion rather than just a curiosity.

By 2025, Copilot had expanded well beyond autocomplete: Copilot Chat lets you ask questions about code, explain functions, and get refactoring suggestions in a conversational interface. Copilot agent mode enables multi-file edits where Copilot acts on a high-level instruction across multiple files in the codebase.

Copilot competes now with Cursor, Windsurf, Claude Code, and Cline on features and model quality. The main Copilot advantage is distribution: it ships built into VS Code with GitHub integration for the largest developer audience. The main limitations are that it's tied to Microsoft's ecosystem and its agent mode is less powerful than dedicated agentic tools.

This definition is AI-generated and refreshed weekly. It may contain inaccuracies. Use your own judgment, especially for production decisions.

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