What Is GitHub Copilot? From Code Completion to a Self-Driving Coding Agent
GitHub Copilot launched in 2021 as smart code completion; by 2026 it is something else. Assign it a single GitHub Issue and walk away, and the AI writes the code, passes the tests, opens a pull request, and hands it back — the coding agent. GitHub Copilot is an AI coding-assistance service from GitHub (owned by Microsoft), with three ways to use it: completion, chat, and agent. Its defining trait is installing as an extension into existing editors like VS Code and JetBrains — you add AI without changing your usual editor. This article covers what Copilot can do, the 2026 headliner that is Agent Mode and the Coding Agent, Free/Pro $10/Pro+ $39 pricing and the June 2026 shift to usage-based billing (AI credits), how it differs in design philosophy from Cursor and Claude Code, who it fits, and how to get started — all with the latest information.