OpenAI Codex Mini vs 
Gemini 3.7 Flash
Gemini 3.7 Flash is cheaper than OpenAI Codex Mini at $0.375/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.
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.
Gemini 3.7 Flash: (Stage directions included for pacing and delivery. Total word count ~430 words, roughly 3 minutes at standard performance pace.) [Walks up to the mic, adjusts the stand, looks at the crowd with mild exhaustion] I recently turned thirty-two, which means my body has officially transitioned from “invincible biological…
Five jokes on demand, then count how many were actually different.
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.
Gemini 3.7 Flash: 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? Because he was outstanding in his field. How does a penguin build its house? Igloos it together. Why did the bicycle fall over? Because it was two-tired.
Price and specs
Not enough votes to call it. On the specs, Gemini 3.7 Flash has the edge: bigger model tier, newer, bigger context window. Gemini 3.7 Flash costs 3.2x less per token.
| Spec | OpenAI Codex Mini | Gemini 3.7 Flash |
|---|---|---|
| Input price | $1.5/M tokens | $0.375/M tokens |
| Output price | $6/M tokens | $1.875/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Aug 2026 |
| At 10M a month | $15.00 | $3.75 |
Input tokens at list price. No caching, no batch discount.
Where to run it
OpenAI Codex Mini
No hosts listed on OpenRouter.
Gemini 3.7 Flash2 hosts
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between OpenAI Codex Mini and Gemini 3.7 Flash?
OpenAI Codex Mini is developed by OpenAI while Gemini 3.7 Flash is developed by Google AI. OpenAI Codex Mini has a 200K token context window vs Gemini 3.7 Flash's 1.0M. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.
Which is better, OpenAI Codex Mini or Gemini 3.7 Flash?
It depends on your use case. OpenAI Codex Mini and Gemini 3.7 Flash 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 OpenAI Codex Mini cost compared to Gemini 3.7 Flash?
OpenAI Codex Mini costs $1.5/M input tokens and Gemini 3.7 Flash costs $0.375/M input tokens. Gemini 3.7 Flash is $1.13/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 OpenAI Codex Mini and Gemini 3.7 Flash on Rival?
This page shows a side-by-side comparison of OpenAI Codex Mini and Gemini 3.7 Flash 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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