Open-source terminal coding agent that pairs with git, edits multiple files at once, and works with any leading LLM.
Open-source terminal coding agent that pairs with git, edits multiple files at once, and works with any leading LLM.
Aider is one of the original terminal-native AI pair programmers and remains a favorite of developers who want a lightweight, git-first workflow. You launch aider inside a repo, tell it what to change, and it reads the relevant files, proposes an edit as a diff, applies it, and automatically commits the change with a descriptive message. Because every step is a git commit, undoing anything is a simple git reset. Aider supports diff, whole-file, and unified-diff edit formats and picks the right one per model to maximize edit success rate.
Aider is model-agnostic. You bring your own key for Anthropic Claude, OpenAI GPT-5, Google Gemini, xAI Grok, DeepSeek, Groq, Fireworks, Together, OpenRouter, or any OpenAI-compatible endpoint including self-hosted Ollama or vLLM. It maintains an ongoing published leaderboard of models against a code-editing benchmark, which has become one of the most-cited comparisons in the community. Notable features include voice-to-code, repo-map indexing for large codebases, /architect mode for reasoning-first planning, and an experimental MCP client so Aider can call external tools. The project is Apache-2.0 licensed, has no commercial upsell, and is entirely community-maintained. It is the tool most experienced engineers reach for when they want a terminal agent that does one thing (edit code with git) extremely well.
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The strongest free AI coding tool for terminal-native developers who want full model choice. Competes with paid alternatives on real-world benchmarks but requires comfort with command-line workflows and careful API cost management.
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Homepage highlights support for Claude 3.7 Sonnet, DeepSeek R1 & Chat V3, OpenAI o1, and o3-mini — all 2025-era frontier models. Usage stats reported: 44K GitHub stars, 6.8M installs, 15 billion tokens processed per week, and an 88% 'singularity' score (percentage of Aider's own code written by Aider). No explicit 2026 roadmap is published on the homepage.
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