What is the difference between Claude Opus 4.1 and OpenAI Codex Mini?

Claude Opus 4.1 is developed by Anthropic while OpenAI Codex Mini is developed by OpenAI. Claude Opus 4.1 has a 200K token context window vs OpenAI Codex Mini's 200K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or OpenAI Codex Mini?

It depends on your use case. Claude Opus 4.1 and OpenAI Codex Mini 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.

How much does Claude Opus 4.1 cost compared to OpenAI Codex Mini?

Claude Opus 4.1 costs $15/M input tokens and OpenAI Codex Mini costs $1.5/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.

How can I compare Claude Opus 4.1 and OpenAI Codex Mini on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 and OpenAI Codex Mini 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 Aug 2025

Claude Opus 4.1vsOpenAI Codex Mini

OpenAI Codex Mini is cheaper than Claude Opus 4.1 at $1.5/M vs $15/M input tokens.

Claude Opus 4.1 and OpenAI Codex Mini compared across 10 shared prompts
Spec	Claude Opus 4.1	OpenAI Codex Mini
Input price	$15/M tokens	$1.5/M tokens
Output price	$75/M tokens	$6/M tokens
Context window	200K tokens	200K tokens
Parameters	Not disclosed	Not disclosed
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Aug 2025	May 2025
SWE-bench Verified	74.5%	71.3%

Side by side

Same prompt, both answers

Opening lines from 2 of the 10 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.

Claude Opus 4.1576 words

"MODERN LIFE SURVIVAL GUIDE" You know what nobody tells you about being an adult? The sheer amount of lying involved. Not big lies – tiny, constant lies just to function in society. Someone shows you a photo of their baby: "Oh wow, beautiful!" That baby looks like a worried potato. But you can't SAY that.

Read the full answer

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

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude Opus 4.175 words

Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything! What do you call a bear with no teeth? A gummy bear! Why did the scarecrow win an award? He was outstanding in his field! What do you call a fake noodle? An impasta! Why don't eggs tell jokes? They'd crack each other up!

Read the full answer

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

Our Verdict

Claude Opus 4.1

OpenAI Codex MiniRunner-up

Not enough votes to call it. On the specs, Claude Opus 4.1 has the edge: bigger model tier, newer.

OpenAI Codex Mini costs 13x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Opus 4.1

Input

$15.00

Output

$75.00

OpenAI Codex Mini

Input

$1.50

10× cheaper

Output

$6.00

13× cheaper

OpenAI Codex Mini is cheaper on both: 10× input, 13× output.

Where to run it

2 hosts

Claude Opus 4.12 hosts

HostInOutContextUptime

Amazon Bedrock$15.00 in$75.00 out200k100% up Google Vertex AI$15.00 in$75.00 out200k—

OpenAI Codex Mini

No hosts listed on OpenRouter.

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

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Same prompt, both answers

Generate a Stand-Up Routine

Stochastic Consistency Test

Cost per 1M tokens

2 hosts

What we learned reading every model

Common questions

What is the difference between Claude Opus 4.1 and OpenAI Codex Mini?

Which is better, Claude Opus 4.1 or OpenAI Codex Mini?

How much does Claude Opus 4.1 cost compared to OpenAI Codex Mini?

How can I compare Claude Opus 4.1 and OpenAI Codex Mini on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Same prompt, both answers

Generate a Stand-Up Routine

Stochastic Consistency Test

Cost per 1M tokens

2 hosts

What we learned reading every model

Common questions

What is the difference between Claude Opus 4.1 and OpenAI Codex Mini?

Which is better, Claude Opus 4.1 or OpenAI Codex Mini?

How much does Claude Opus 4.1 cost compared to OpenAI Codex Mini?

How can I compare Claude Opus 4.1 and OpenAI Codex Mini on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages