OpenAI Codex Mini vs 
DeepSeek V4 Flash 0731
DeepSeek V4 Flash 0731 is cheaper than OpenAI Codex Mini at $0.14/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 promptsFive 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.
DeepSeek V4 Flash 0731: Here are 5 jokes: Why don’t scientists trust atoms? Because they make up everything. I told my wife she should embrace her mistakes. She gave me a hug. Why did the scarecrow win an award? Because he was outstanding in his field. I’m reading a book on anti-gravity. It’s impossible to put down.
Three 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.
DeepSeek V4 Flash 0731: (Walks on stage, adjusts mic, takes a sip of water. Waves to the back row.) Alright, how's everyone doing tonight? Good, good. You know, I was thinking about this on the way here. I’m at that age now where I have a favorite spatula. I have opinions on paper towels.
Price and specs
Not enough votes to call it. On the specs, DeepSeek V4 Flash 0731 has the edge: bigger model tier, newer, bigger context window. DeepSeek V4 Flash 0731 costs 21x less per token.
| Spec | OpenAI Codex Mini | DeepSeek V4 Flash 0731 |
|---|---|---|
| Input price | $1.5/M tokens | $0.14/M tokens |
| Output price | $6/M tokens | $0.28/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Jul 2026 |
| At 10M a month | $15.00 | $1.40 |
Input tokens at list price. No caching, no batch discount.
Where to run it
OpenAI Codex Mini
No hosts listed on OpenRouter.
DeepSeek V4 Flash 073124 hosts
- OpenInferencefp4$0.01 in$1.54 out1M99% up
- Relacefp4$0.01 in$1.28 out1M100% up
- Reka$0.02 in$0.53 out262k96.7% up
- DeepInfrafp8$0.06 in$0.18 out1M100% up
- StreamLakefp8$0.09 in$0.26 out1M100% up
- Sail Researchfp4$0.10 in$0.30 out1M100% up
18 more hostsFewer hosts
- DigitalOcean$0.12 in$0.24 out1M100% up
- Wafer$0.13 in$0.23 out1M100% up
- Basetenfp8$0.13 in$0.26 out1M99.9% up
- Venice$0.13 in$0.26 out1M99.9% up
- CoreWeavefp8$0.13 in$0.28 out262k100% up
- Cohere$0.14 in$0.28 out1M99.4% up
- Parasailfp8$0.14 in$0.28 out1M100% up
- Together$0.14 in$0.28 out1M100% up
- Inceptronfp4$0.15 in$0.60 out1M99% up
- Mancerfp8$0.20 in$0.60 out1M99.7% up
- SiliconFlowfp8$0.22 in$0.66 out1M99.5% up
- GMI Cloudfp8$0.29 in$0.86 out1M100% up
- Phala$0.31 in$0.92 out1M100% up
- Alibaba Cloud$0.35 in$1.06 out1M100% up
- Novitafp8$0.41 in$1.23 out1M100% up
- AtlasCloudfp4$0.44 in$1.32 out1M100% up
- Baidu Qianfanfp8$0.44 in$1.32 out1M99.9% up
- Cloudflare Workers AI$0.44 in$1.32 out1M99.1% up
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between OpenAI Codex Mini and DeepSeek V4 Flash 0731?
OpenAI Codex Mini is developed by OpenAI while DeepSeek V4 Flash 0731 is developed by DeepSeek. OpenAI Codex Mini has a 200K token context window vs DeepSeek V4 Flash 0731'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 DeepSeek V4 Flash 0731?
It depends on your use case. OpenAI Codex Mini and DeepSeek V4 Flash 0731 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 DeepSeek V4 Flash 0731?
OpenAI Codex Mini costs $1.5/M input tokens and DeepSeek V4 Flash 0731 costs $0.14/M input tokens. DeepSeek V4 Flash 0731 is $1.36/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 DeepSeek V4 Flash 0731 on Rival?
This page shows a side-by-side comparison of OpenAI Codex Mini and DeepSeek V4 Flash 0731 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.
More comparisons
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