Claude Haiku 5.5 vs 
OpenAI Codex Mini
Claude Haiku 5.5 is cheaper than OpenAI Codex Mini at $0.1/M vs $1.5/M input tokens.
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
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Which answer wins?
Written rounds
2 promptsThree minutes of stand-up. Puns are banned.
Claude Haiku 5.5: "My Smart Fridge Judges Me" So I got a smart fridge. Everybody told me I needed one. "It'll tell you when you're out of milk!" Great. I didn't know I needed a fridge with a notification system. I just wanted cold food.
OpenAI Codex Mini: [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.
Five jokes on demand, then count how many were actually different.
Claude Haiku 5.5: Here are 5 jokes: Why don't scientists trust atoms? Because they make up everything. What do you call a fake noodle? An impasta. Why did the scarecrow win an award? He was outstanding in his field. What do you call a bear with no teeth? A gummy bear. Why did the math book look so sad? Because it had too many problems.
OpenAI Codex Mini: 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.
Price and specs
| Spec | Claude Haiku 5.5 | OpenAI Codex Mini |
|---|---|---|
| Input price | $0.1/M tokens | $1.5/M tokens |
| Output price | $0.5/M tokens | $6/M tokens |
| Context window | 1.0M tokens | 200K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Oct 2026 | May 2025 |
| At 10M a month | $1.00 | $15.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
OpenAI Codex Mini
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between Claude Haiku 5.5 and OpenAI Codex Mini?
Claude Haiku 5.5 is developed by Anthropic while OpenAI Codex Mini is developed by OpenAI. Claude Haiku 5.5 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.
Which is better, Claude Haiku 5.5 or OpenAI Codex Mini?
It depends on your use case. Claude Haiku 5.5 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.
How much does Claude Haiku 5.5 cost compared to OpenAI Codex Mini?
Claude Haiku 5.5 costs $0.1/M input tokens and OpenAI Codex Mini costs $1.5/M input tokens. Claude Haiku 5.5 is $1.40/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 Haiku 5.5 and OpenAI Codex Mini on Rival?
This page shows a side-by-side comparison of Claude Haiku 5.5 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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