OpenAI Codex Mini vs 
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview is cheaper than OpenAI Codex Mini at $0.25/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 3.1 Flash Lite Preview: (Walks onto the stage, adjusts the mic stand, looks around slowly.) Hi. How’s everybody doing? Good? Good. I’m doing okay. I’ve reached that age where my body has started making sound effects. Like, I’ll just stand up from the couch and my knees go “CRACK.” It’s not even a movement; it’s a closing argument.
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 3.1 Flash Lite Preview: Here are 5 jokes for you: 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 couldn't the bicycle stand up by itself?
Price and specs
| Spec | OpenAI Codex Mini | Gemini 3.1 Flash Lite Preview |
|---|---|---|
| Input price | $1.5/M tokens | $0.25/M tokens |
| Output price | $6/M tokens | $1.5/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Weights | — | Closed |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Mar 2026 |
| At 10M a month | $15.00 | $2.50 |
Input tokens at list price. No caching, no batch discount.
Where to run it
OpenAI Codex Mini
No hosts listed on OpenRouter.
Gemini 3.1 Flash Lite Preview1 host
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between OpenAI Codex Mini and Gemini 3.1 Flash Lite Preview?
OpenAI Codex Mini is developed by OpenAI while Gemini 3.1 Flash Lite Preview is developed by Google AI. OpenAI Codex Mini has a 200K token context window vs Gemini 3.1 Flash Lite Preview'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 3.1 Flash Lite Preview?
It depends on your use case. OpenAI Codex Mini and Gemini 3.1 Flash Lite Preview 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 3.1 Flash Lite Preview?
OpenAI Codex Mini costs $1.5/M input tokens and Gemini 3.1 Flash Lite Preview costs $0.25/M input tokens. Gemini 3.1 Flash Lite Preview is $1.25/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 3.1 Flash Lite Preview on Rival?
This page shows a side-by-side comparison of OpenAI Codex Mini and Gemini 3.1 Flash Lite Preview 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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