What is the difference between OpenAI Codex Mini and Grok 3?

OpenAI Codex Mini is developed by OpenAI while Grok 3 is developed by xAI. OpenAI Codex Mini has a 200K token context window vs Grok 3's 128K. You can compare their actual outputs across 9 challenges on Rival to see how they differ in practice.

Which is better, OpenAI Codex Mini or Grok 3?

It depends on your use case. OpenAI Codex Mini and Grok 3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 9 challenges so you can judge which fits your needs best.

How can I compare OpenAI Codex Mini and Grok 3 on Rival?

This page shows a side-by-side comparison of OpenAI Codex Mini and Grok 3 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated May 2025

OpenAI Codex MinivsGrok 3

OpenAI Codex Mini has a larger context window than Grok 3 (200K tokens vs 128K tokens).

OpenAI Codex Mini and Grok 3 compared across 9 shared prompts
Spec	OpenAI Codex Mini	Grok 3
Input price	$1.5/M tokens	—
Output price	$6/M tokens	—
Context window	200K tokens	128K tokens
Free API (OpenRouter)	No	No
Released	May 2025	Feb 2025
SWE-bench Verified	71.3%	63.8%