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  5. OpenAI Codex Minivso1
Updated May 2025

OpenAI Codex Minivso1

OpenAI Codex Mini is cheaper than o1 at $1.5/M vs $15/M input tokens.

OpenAI Codex Mini and o1 compared across 10 shared prompts
SpecOpenAI Codex Minio1
Input price$1.5/M tokens$15/M tokens
Output price$6/M tokens$60/M tokens
Context window200K tokens128K tokens
ParametersNot disclosedNot disclosed
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMay 2025Dec 2024
SWE-bench Verified71.3%48.9%
Side by side

Same prompt, both answers

Opening lines from 2 of the 10 prompts both answered. Formatting stripped, words untouched.

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
o185 words
Here are five jokes: Why did the scarecrow get promoted? Because he was outstanding in his field. I told my friend she drew her eyebrows too high. She looked surprised. What do you call cheese that isn’t yours? Nacho cheese. Why don’t skeletons fight each other? Because they don’t have the guts.
Read the full answer

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
o1417 words
[Comic steps on stage, takes the mic] “Hey everyone, thanks for coming out tonight. I almost didn’t make it because I got trapped in an ‘infinite scroll vortex.’ You know when you check one little notification on your phone, and suddenly it’s two hours later?
Read the full answer
Our Verdict
OpenAI Codex Mini
OpenAI Codex Mini
o1
o1Runner-up

Not enough votes to call it. On the specs, OpenAI Codex Mini has the edge: newer, bigger context window.

OpenAI Codex Mini costs 10x less per token.

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
10× cheaper
Output
$6.00
10× cheaper
o1
Input
$15.00
Output
$60.00

OpenAI Codex Mini is cheaper on both: 10× input, 10× output.

Where to run it

1 host

OpenAI Codex Mini

No hosts listed on OpenRouter.

o11 host
HostInOutContextUptime
OpenAI$15.00 in·$60.00 out·200k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 20 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Both are developed by OpenAI but target different use cases. OpenAI Codex Mini has a 200K token context window vs o1's 128K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

It depends on your use case. OpenAI Codex Mini and o1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

OpenAI Codex Mini costs $1.5/M input tokens and o1 costs $15/M input tokens. OpenAI Codex Mini is $13.50/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of OpenAI Codex Mini and o1 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
o1 logo
o159 outputs, specs and price
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