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  5. OpenAI Codex MinivsGPT-5.3-Codex
Updated Feb 2026

OpenAI Codex MinivsGPT-5.3-Codex

OpenAI Codex Mini is cheaper than GPT-5.3-Codex at $1.5/M vs $1.75/M input tokens.

OpenAI Codex Mini and GPT-5.3-Codex compared across 10 shared prompts
SpecOpenAI Codex MiniGPT-5.3-Codex
Input price$1.5/M tokens$1.75/M tokens
Output price$6/M tokens$14/M tokens
Context window200K tokens400K tokens
Weights—Closed
Free API (OpenRouter)NoNo
ReleasedMay 2025Feb 2026
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
GPT-5.3-Codex78 words
Sure—here are 5 jokes: Why don’t skeletons fight each other? They don’t have the guts. I told my computer I needed a break… Now it won’t stop sending me KitKat ads. Why did the math book look sad? It had too many problems. I used to play piano by ear… Now I use my hands. Why did the scarecrow win an award?
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
GPT-5.3-Codex460 words
Good evening, everybody! I’ve reached that age where my body sends me passive-aggressive emails. Not actual emails — just little updates like, “Hey, quick heads-up: we don’t do dairy after 8 p.m. anymore.” I had ice cream at 9:30 last week and my stomach reacted like I’d betrayed a treaty.
Read the full answer
Our Verdict
GPT-5.3-Codex
GPT-5.3-Codex
OpenAI Codex Mini
OpenAI Codex MiniRunner-up

Not enough votes to call it. On the specs, GPT-5.3-Codex has the edge: bigger model tier, newer, bigger context window.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

OpenAI Codex Mini
Input
$1.50
1.2× cheaper
Output
$6.00
2.3× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00

OpenAI Codex Mini is cheaper on both: 1.2× input, 2.3× output.

Where to run it

2 hosts

OpenAI Codex Mini

No hosts listed on OpenRouter.

GPT-5.3-Codex2 hosts
HostInOutContextUptime
Azure AI Foundry$1.75 in·$14.00 out·400k·100% upOpenAI$1.75 in·$14.00 out·400k·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 23 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 GPT-5.3-Codex's 400K. 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 GPT-5.3-Codex 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 GPT-5.3-Codex costs $1.75/M input tokens. OpenAI Codex Mini is $0.25/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 GPT-5.3-Codex 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.

Keep exploring

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Model pages

OpenAI Codex Mini logo
OpenAI Codex Mini10 outputs, specs and price
GPT-5.3-Codex logo
GPT-5.3-Codex53 outputs, specs and price
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