The broadest-adoption coding assistant, now a multi-model platform after GitHub added Claude and Codex as backends in February 2026 alongside OpenAI. Deep integration with VS Code, JetBrains, Neovim, and GitHub.com.
From Wikipedia
GitHub Copilot is a code completion and programming AI-assistant developed by GitHub and OpenAI that assists users of Visual Studio Code, Visual Studio, Neovim, Eclipse and JetBrains integrated development environments (IDEs) by autocompleting code. Currently available by subscription to individual developers and to businesses, the generative artificial intelligence software was first announced by GitHub on 29 June 2021. Users can choose the large language model used for generation.