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  5. OpenAI Codex MinivsGrok 3
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
SpecOpenAI Codex MiniGrok 3
Input price$1.5/M tokens—
Output price$6/M tokens—
Context window200K tokens128K tokens
Free API (OpenRouter)NoNo
ReleasedMay 2025Feb 2025
SWE-bench Verified71.3%63.8%
Side by side

Same prompt, both answers

Opening lines from 2 of the 9 prompts both answered. Formatting stripped, words untouched.

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

OpenAI Codex Mini595 words
[Comedian walks onstage] Hey, everyone! Great to see you all tonight. I'm Jamie—if you thought that intro was enthusiastic, you should've seen me when I realized this place has Wi-Fi. Seriously, though, I love stand-up.
Read the full answer
Grok 3477 words
Alright, here’s a 3-minute stand-up comedy routine—no puns, just some observational absurdity and a bit of self-deprecation to keep it relatable. Hey, everybody! Good to be here. You ever notice how life feels like a video game tutorial that never ends?
Read the full answer

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

OpenAI Codex Mini75 words
Sure—here are five jokes: I asked the librarian if books about paranoia were available. She whispered, "They're right behind you." Why did the tomato turn red? Because it saw the salad dressing. I bought a boat because it was for sail. Don't trust stairs—they're always up to something.
Read the full answer
Grok 3151 words
Here are five jokes for you: Why don’t skeletons fight each other? Because they don’t have the guts! What has 4 legs and 1 arm? A pitbull coming back from the park! Why don’t skeletons fight each other? They’re too busy rattling around! What do you call a bear with no teeth? A gummy bear! Why did the tomato turn red?
Read the full answer
Our Verdict
OpenAI Codex Mini
OpenAI Codex Mini
Grok 3
Grok 3

Not enough votes to call it. On the specs, nothing separates them.

OpenAI Codex Mini takes Image Generation.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

OpenAI Codex Mini
Input
$1.50
Output
$6.00
Grok 3
Input
—
Output
—
Research

What we learned reading every model

FAQ

Common questions

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.

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.

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.

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Model pages

OpenAI Codex Mini logo
OpenAI Codex Mini10 outputs, specs and price
Grok 3 logo
Grok 357 outputs, specs and price
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