Aider is an AI-powered coding companion integrated into your terminal. It allows developers to pair program with large language models (LLMs) to edit code within their local Git repositories. Aider works best with models like GPT-4o and Claude 3 Opus, and can connect to nearly all LLMs. It helps developers improve coding efficiency by automatically committing code changes with sensible commit messages. Aider supports multiple popular programming languages including Python, JavaScript, and TypeScript, and can handle coordinated changes within large codebases.