Directory
GitHub Copilot
Assistant + CLI (all major IDEs)
Free tier + paidAI IDEs & coding agentsgithub.com
What it is
The incumbent, embedded in VS Code, JetBrains, Visual Studio, Xcode, Neovim and github.com, plus a terminal agent called Copilot CLI and a cloud coding agent that opens pull requests. Model choice spans Claude Haiku, Sonnet and Opus, GPT-5 mini and Gemini, selectable per request.
Why it earns a slot
The safe institutional choice: your employer probably already pays for it, it works in the IDE you already use, and the free tier with 2,000 completions a month is the lowest-friction on-ramp in the whole category.
Know before you commit
Premium requests are the real currency — each agent prompt eats quota, and Pro's $15 of monthly credits goes quickly on Opus-class models. Copilot CLI needs an active subscription and can be disabled by org admins.
Getting started
npm install -g @github/copilotAlso in AI IDEs & coding agents
Aider
aider.chat
Terminal pair programmer (OSS)
FreeAI IDEs & coding agents
Free and open source (Apache 2.0) · BYO API key
Open dossier
Antigravity CLI (ex-Gemini CLI)
antigravity.google
Terminal coding agent (Google)
Free tier + paidAI IDEs & coding agents
Free tier · Google AI Pro ~$20/mo · Ultra ~$100/mo · Ultra Max ~$200/mo
Open dossier
Augment Code
augmentcode.com
Team agent platform (Cosmos)
PaidAI IDEs & coding agents
$100/mo Business (up to 50 seats, $100 usage included) · Enterprise custom
Open dossier
Cline
cline.bot
Open-source agent (VS Code/CLI)
FreeAI IDEs & coding agents
Free and open source (Apache 2.0) · BYO key or pay-as-you-go credits
Open dossier