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  5. Claude Fable 5vsOpenAI Codex Mini
Updated Jun 2026

Claude Fable 5vsOpenAI Codex Mini

OpenAI Codex Mini is cheaper than Claude Fable 5 at $1.5/M vs $10/M input tokens.

Claude Fable 5 and OpenAI Codex Mini compared across 10 shared prompts
SpecClaude Fable 5OpenAI Codex Mini
Input price$10/M tokens$1.5/M tokens
Output price$50/M tokens$6/M tokens
Context window1.0M tokens200K tokens
WeightsClosed—
Free API (OpenRouter)NoNo
ReleasedJun 2026May 2025
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 Fable 5494 words
"Adulting Is a Scam" Hey, how's everybody doing? Good? Liars. Nobody's doing good. We're all just out here pretending. So I'm at the age now where my body has started making announcements. Like, I didn't ask for updates, but my knees have opinions now.
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 Fable 582 words
Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. Why did the scarecrow win an award? Because he was outstanding in his field. What do you call a fake noodle? An impasta. Why don't skeletons fight each other? They don't have the guts. What do you call a fake noodle? An impasta.
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 Fable 5
Claude Fable 5
OpenAI Codex Mini
OpenAI Codex MiniRunner-up

Not enough votes to call it. On the specs, Claude Fable 5 has the edge: bigger model tier, newer, bigger context window.

OpenAI Codex Mini costs 8.3x less per token.

Slight edge

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Fable 5
Input
$10.00
Output
$50.00
OpenAI Codex Mini
Input
$1.50
6.7× cheaper
Output
$6.00
8.3× cheaper

OpenAI Codex Mini is cheaper on both: 6.7× input, 8.3× output.

Where to run it

4 hosts

Claude Fable 54 hosts
HostInOutContextUptime
Amazon Bedrock$10.00 in·$50.00 out·1M—Azure AI Foundry$10.00 in·$50.00 out·1M·99.8% upAnthropic$10.00 in·$50.00 out·1M·100% upGoogle Vertex AI$10.00 in·$50.00 out·1M·99.9% up
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

Claude Fable 5 is developed by Anthropic while OpenAI Codex Mini is developed by OpenAI. Claude Fable 5 has a 1.0M 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.

It depends on your use case. Claude Fable 5 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.

Claude Fable 5 costs $10/M input tokens and OpenAI Codex Mini costs $1.5/M input tokens. OpenAI Codex Mini is $8.50/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 Claude Fable 5 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.

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Model pages

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Claude Fable 558 outputs, specs and price
OpenAI Codex Mini logo
OpenAI Codex Mini10 outputs, specs and price
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