AI Reference
GitHub Copilot
AI coding assistant that plugs into your existing editor. Autocomplete, chat, agent mode.
Last updated: October 2026
GitHub Copilot is an AI coding assistant that works inside your existing editor. It provides autocomplete, chat, and — uniquely — can turn GitHub issues into pull requests.
Full definition: Copilot integrates into VS Code, JetBrains, Neovim, Xcode, and Eclipse. It offers a free tier with 2,000 completions per month, plus a coding agent that works asynchronously on GitHub issues.
📊 By the Numbers (2026)
| Metric | Value |
|---|---|
| Paid subscribers | 4.7M+ |
| YoY growth | 75% |
| Workplace usage (JetBrains) | 21% (#2) |
| Editor support | 6+ editors |
Install
- Open Extensions panel (
Ctrl+Shift+X) - Search "GitHub Copilot"
- Install the extension by GitHub
- Sign in with GitHub when prompted
JetBrains, Neovim, and Xcode users install from their marketplaces.
Inline Autocomplete
As you type, Copilot shows gray ghost text. Press Tab to accept.
# Start typing a comment
# Prompt the user for their name and greet them
# Copilot suggests:
name = input("What is your name? ")
print(f"Hello, {name}!")Comments are prompts. Clear comments produce better suggestions.
Copilot Chat
Open with Ctrl+Alt+I or Control+Command+I. Try:
"Explain this function"
"Write unit tests for this code"
"Refactor this to use async/await"
"Find bugs in the selected code"Agent Mode & Background Tasks
Copilot's most distinctive feature — assign a GitHub issue to @copilot:
# In GitHub:
# 1. Open an issue
# 2. Assign it to @copilot
# 3. Copilot creates a branch, writes code, opens a PRNo other AI coding tool offers this async, delegated workflow.
Pricing
| Tier | Price |
|---|---|
| Free | 2,000 completions + 50 chats/mo |
| Pro | $10/mo |
| Pro+ | $39/mo |
⚠️ Common Mistakes
- Accepting suggestions blindly. Copilot generates plausible code, not always correct code.
- Not using comments as prompts. Clear comments dramatically improve suggestion quality.
- Ignoring the free tier. 2,000 completions + 50 chats per month is enough to evaluate.
- Expecting agent mode to replace you. Copilot's agentic features are less polished than Cursor's.
- Forgetting about AI Credits. Premium models consume credits at $0.01 each.
❓ Frequently Asked Questions
What is GitHub Copilot?
GitHub Copilot is an AI coding assistant that integrates into editors like VS Code, JetBrains, and Neovim. It provides inline autocomplete, chat, agent mode, and can turn GitHub issues into pull requests.
Is GitHub Copilot free?
Yes. Copilot has a free tier with 2,000 completions and 50 chat requests per month. Paid plans start at $10/month for Pro.
What editors does Copilot support?
Copilot supports VS Code, Visual Studio, JetBrains IDEs, Neovim, Xcode, and Eclipse. It works as an extension.
What is Copilot Chat?
Copilot Chat is an interactive AI panel inside your editor. Open it with Ctrl+Alt+I or Control+Command+I. Ask questions, request explanations, generate tests, or refactor code.
How does Copilot agent mode work?
Assign a GitHub issue to @copilot. Copilot creates a branch, writes code, runs tests, and opens a pull request asynchronously. This is Copilot's most distinctive feature.