Aider is AI pair programming in your terminal

Aider lets you pair program with LLMs, to edit code in your local git repository. Start a new project or work with an existing code base. Aider works best with Claude 3.5 Sonnet, DeepSeek V3, o1 & GPT-4o and can connect to almost any LLM.

Getting started

If you already have python 3.8-3.13 installed, you can get started quickly like this:

python -m pip install aider-install
aider-install

# Change directory into your code base
cd /to/your/project

# Work with Claude 3.5 Sonnet on your code
aider --model sonnet --anthropic-api-key your-key-goes-here

# Work with GPT-4o on your code
aider --model gpt-4o --openai-api-key your-key-goes-here

See the installation instructions and usage documentation for more details.

Features

Top tier performance

Aider has one of the top scores on SWE Bench. SWE Bench is a challenging software engineering benchmark where aider solved real GitHub issues from popular open source projects like django, scikitlearn, matplotlib, etc.

More info

Kind words from users

  • The best free open source AI coding assistant.IndyDevDan
  • The best AI coding assistant so far.Matthew Berman
  • Aider … has easily quadrupled my coding productivity.SOLAR_FIELDS
  • It’s a cool workflow… Aider’s ergonomics are perfect for me.qup
  • It’s really like having your senior developer live right in your Git repo - truly amazing!rappster
  • What an amazing tool. It’s incredible.valyagolev
  • Aider is such an astounding thing!cgrothaus
  • It was WAY faster than I would be getting off the ground and making the first few working versions.Daniel Feldman
  • THANK YOU for Aider! It really feels like a glimpse into the future of coding.derwiki
  • It’s just amazing. It is freeing me to do things I felt were out my comfort zone before.Dougie
  • This project is stellar.funkytaco
  • Amazing project, definitely the best AI coding assistant I’ve used.joshuavial
  • I absolutely love using Aider … It makes software development feel so much lighter as an experience.principalideal0
  • I have been recovering from multiple shoulder surgeries … and have used aider extensively. It has allowed me to continue productivity.codeninja
  • I am an aider addict. I’m getting so much more work done, but in less time.dandandan
  • After wasting $100 on tokens trying to find something better, I’m back to Aider. It blows everything else out of the water hands down, there’s no competition whatsoever.SystemSculpt
  • Aider is amazing, coupled with Sonnet 3.5 it’s quite mind blowing.Josh Dingus
  • Hands down, this is the best AI coding assistant tool so far.IndyDevDan
  • [Aider] changed my daily coding workflows. It’s mind-blowing how a single Python application can change your life.maledorak
  • Best agent for actual dev work in existing codebases.Nick Dobos