https://aider.chat/#getting-started

Aider lets you pair program with LLMs to start a new project or build on your existing codebase.

Aider works best with these models, which are skilled at editing code:

Gemini 2.5 Pro
DeepSeek R1 and V3
Claude 3.7 Sonnet
OpenAI o3, o4-mini and GPT-4.1