Aider vs OpenAI Codex CLI

Pick two tools from the same category to compare side-by-side.

	Aider OSS AI pair programmer for the terminal; multi-model, git-native.	OpenAI Codex CLI OpenAI's official terminal coding agent; adopts the SKILL.md standard.
Category	harness	harness
Vendor type	open source	open source
Pricing	free	freemium
Strengths	+ Fully open source + Multi-model (Anthropic, OpenAI, OpenRouter, local) + Git-native commit-per-change workflow	+ Adopts cross-vendor SKILL.md standard + Open source + Native OpenAI Responses API integration
Tradeoffs	− Less polished than IDE-based harnesses − No managed plugin ecosystem	− Smaller plugin ecosystem than Claude Code
Used in stacks	1	0