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GitHub Copilot

GitHub Copilot is an AI-powered coding assistant that suggests code, answers questions, and increasingly performs tasks independently within the developer's editor.

In plain terms

Imagine sitting next to a very well-read colleague while you write, who guesses half your sentences before you write them down. GitHub Copilot does the same for programmers: while typing, it suggests the next line or even a whole code snippet, and the developer accepts or rejects it with a single button press.

By now, it is much more than that. In a chat window, you can ask what an unknown code snippet does, why a program is faulty, or how to write a test for it. In agent mode, you can entrust an entire task: it modifies multiple files, runs commands, and hands over the work for verification at the end.

The name reveals its role: a copilot means a second pilot. The human still drives the machine, makes the decisions, and is responsible for the outcome. What sets it apart from a general chatbot is that it works where the code is written: inside the editor and on the GitHub interface, seeing the project files.

How it works

1. Copilot integrates into the developer's editor (for example, Visual Studio Code) and monitors what you are working on: the open files, the area around the cursor, and comments.
2. It sends this environment to a large language model running in the cloud, which has learned from vast code and text what typically follows a given situation.
3. The model returns a suggestion: a continuation of a line, a full function, or an explanation in the chat. Code suggestions appear faintly near the cursor, explanations in the chat window, and you decide whether to accept them.
4. In Agent mode, Copilot breaks down the task into steps, edits multiple files, runs tests, and improves its own work based on error messages.
5. The developer reviews the completed change, and it is only incorporated into the shared code after their approval. For corporate use, the organization sets the rules and access permissions.

An everyday example

Who is affected

A common misconception

Limits and risks

• It can confidently suggest code that references non-existent functions or contains security vulnerabilities, so everything must be reviewed and tested.
• Rarely, a suggestion may match public, licensed code almost verbatim, raising copyright issues.
• To do its work, it sends details of your code to the cloud, so for company or confidential projects, first clarify the data-handling settings and internal policies.
• Agent mode and the use of the most powerful models are limited by plan, and many independent tasks may incur extra costs.

Similar, but not the same

• Microsoft Copilot – Microsoft Copilot is a general office and everyday assistant (Windows, Word, Excel), while GitHub Copilot is designed specifically for programming.
• ChatGPT – ChatGPT, a general-purpose chatbot, works in a separate window, while GitHub Copilot is built into the developer's editor and works directly with the project's files.
• Claude Code – Claude Code is Anthropic's coding agent, which started as a command-line tool. GitHub Copilot is a GitHub product that has grown from code completion toward agent mode.

Related concepts

A brief history

GitHub introduced Copilot as a trial version in 2021, built on the OpenAI Codex model, and made it available via subscription to everyone in 2022. In 2025, it added agent mode and a coding agent that works independently in the background.

Where things stand

By the end of 2026, GitHub Copilot is one of the most well-known AI coding assistants: it allows selection from models by various manufacturers and offers a free tier. The focus has shifted from line completion to independently working agents, competing fiercely with other coding tools.

Status: 2026 November

In the news

• GitHub Copilot impact dashboard adds chat and VS Code agent usage, code review gets API controlsNov 6, 2026 · Code
• Xcode 27.3 adds GitHub Copilot to its built-in assistantNov 3, 2026 · Code
• Copilot Cowork generated 1,211 pull requests in a single dayNov 2, 2026 · Code
• GitHub Copilot Fusion picks models automatically; local preview runs only partly on-deviceNov 2, 2026 · Code
• GitHub Copilot Fusion mixes models to approach frontier coding performance at half the costOct 28, 2026 · Agent Age
• Copilot Studio's GitHub Copilot harness becomes the Microsoft Copilot harnessOct 28, 2026 · Code
• Verisk makes its insurance data available in Microsoft Copilot and Amazon QuickOct 28, 2026 · Money
• AWS Transform can be used in GitHub Copilot via MCP for .NET projectsOct 27, 2026 · Code

Also known as

GitHub Copilot · Copilot · GH Copilot · GitHub Copilot Chat · Copilot agent mode · Copilot coding agent · Copilot coding agent · GitHub Copilot

Sources

• Wikipedia: GitHub Copilot
• GitHub Docs: GitHub Copilot documentation

This entry was machine-edited and has undergone machine expert review; the “In the news” section updates automatically from Agent Age stories.