Aider
An AI pair programmer that edits local git repositories via the terminal.
What is Aider?
Aider is an open-source AI pair programmer that operates directly inside your terminal, allowing you to edit code in your local git repository. Acting as a powerful AI tool, the aider cli connects with your favorite editor and supports almost any large language model, including Claude 3.7 Sonnet, DeepSeek R1, OpenAI o1, o3-mini, and GPT-4o, as well as configurations through Open Router or local models. By using the aider chat interface, developers can seamlessly start new projects or build on existing codebases across more than 100 programming languages, making it a standout tool for polyglot development. Additionally, the project maintains an authoritative coding LLM leaderboard—often referred to as the aider leaderboard or aider benchmark—which evaluates how effectively different models handle complex engineering tasks like code editing and repository map management.
Best Aider use cases by task, role, industry, and platform
These use cases show where Aider fits best, ranked by fit score before popularity or pricing.
Aider Pricing Plans
Compare Aider free options, Aider paid pricing plans, and usage notes before you choose the best way to use this AI tool in 2026.
Free (Open-source CLI tool, users bring their own LLM API keys)
Pricing updated:Jun 11, 2026
Aider AI Features
Aider Pros and Cons
Pros
- Works locally via the terminal and integrates seamlessly with existing git workflows
- Broad model flexibility, including top commercial APIs, local models, and OpenRouter options
- Automatic code safety features like auto-committing changes for easy undos and diffs
- Saves token usage and improves contextual accuracy by generating a local codebase map
Limitations
- Requires familiarity with command-line interfaces and terminal usage
- Relies on external LLM API keys or local hardware setups to function