Aider vs OpenAI Codex

as AI assistants see them, week of 2026-09-14

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Aider edges out OpenAI Codex overall, 22 to 21, and gets named slightly more often too: 27 of 70 answers versus 22 of 70. Aider's strongest showing is Claude, scoring 45 there, while OpenAI Codex peaks with ChatGPT at 37 but scores 0 with Gemini. Both tools tie for the terminal-use question, named in 3 of 3 answers each, and both show up in 3 of 4 answers for whole-codebase coding agents. Head-to-head, each is named more often in 5 questions, with 10 questions ending in a tie. Aider never appears for beginner or VS Code questions; OpenAI Codex never appears for local privacy or free-tool questions.

Head to head

metric	Aider	OpenAI Codex
score	22	21
questions won	16	12

By assistant

Aider

assistant	score	named in, this week	usual spot, this week
ChatGPT	11	20% of answers	#6.5
Claude	45	80% of answers	#6.3
Gemini	12	20% of answers	#5.5
Perplexity	15	25% of answers	#5.4

OpenAI Codex

assistant	score	named in, this week	usual spot, this week
ChatGPT	37	55% of answers	#4.2
Claude	30	45% of answers	#4.3
Gemini	0	0% of answers
Perplexity	8	10% of answers	#3.0

Where they differ

Only Aider gets named for

What's the best open-source AI coding assistant?
What's the best AI coding assistant I can run locally for privacy?
What are the best free AI coding assistants?
What's the best AI tool for writing and fixing React and Next.js code?
What's the best AI coding assistant for Python?

Only OpenAI Codex gets named for

What's the best AI coding assistant for building mobile apps?

More comparisons

Not sold on either?

Scores count how often each assistant names a product, weighted by position. How the score works · Full AI coding assistants leaderboard