Claude Opus 4.7 vs 
OpenAI Codex Mini
OpenAI Codex Mini is cheaper than Claude Opus 4.7 at $1.5/M vs $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 Opus 4.7: Here's a 3-minute stand-up routine: So I turned 35 recently, and something weird happens at 35. Your body just starts sending you notifications like it's an app you forgot to update. I bent down to tie my shoe last week and my knee made a sound. Not a pop. Not a crack. A sound. Like it was trying to communicate.
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 Opus 4.7: Here are 5 jokes for you: Why don't scientists trust atoms? Because they make up everything! I told my wife she was drawing her eyebrows too high. She looked surprised. Why did the scarecrow win an award? Because he was outstanding in his field! I'm reading a book about anti-gravity. It's impossible to put down!
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
Not enough votes to call it. On the specs, Claude Opus 4.7 has the edge: bigger model tier, newer, bigger context window. OpenAI Codex Mini costs 4.2x less per token.
| Spec | Claude Opus 4.7 | OpenAI Codex Mini |
|---|---|---|
| Input price | $5/M tokens | $1.5/M tokens |
| Output price | $25/M tokens | $6/M tokens |
| Context window | 1.0M tokens | 200K tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Apr 2026 | May 2025 |
| At 10M a month | $50.00 | $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 Opus 4.7 and OpenAI Codex Mini?
Claude Opus 4.7 is developed by Anthropic while OpenAI Codex Mini is developed by OpenAI. Claude Opus 4.7 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 Opus 4.7 or OpenAI Codex Mini?
It depends on your use case. Claude Opus 4.7 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 4.7 cost compared to OpenAI Codex Mini?
Claude Opus 4.7 costs $5/M input tokens and OpenAI Codex Mini costs $1.5/M input tokens. OpenAI Codex Mini is $3.50/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 4.7 and OpenAI Codex Mini on Rival?
This page shows a side-by-side comparison of Claude Opus 4.7 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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