OpenAI Codex Mini vs 
Gemma 4 31B
Gemma 4 31B 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?
Price and specs
Not enough votes to call it. On the specs, Gemma 4 31B has the edge: bigger model tier, newer. Gemma 4 31B costs 15x less per token.
| Spec | OpenAI Codex Mini | Gemma 4 31B |
|---|---|---|
| Input price | $1.5/M tokens | $0.14/M tokens |
| Output price | $6/M tokens | $0.4/M tokens |
| Context window | 200K tokens | 262K tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | Yes (1 provider) |
| Released | May 2025 | Apr 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.
Gemma 4 31B12 hosts
- DeepInfrafp4$0.09 in$0.34 out262k99.3% up
- CoreWeavefp4$0.10 in$0.34 out262k99.2% up
- Venicefp4$0.12 in$0.36 out256k99.4% up
- Crusoebf16$0.14 in$0.40 out262k99.5% up
- Friendli$0.14 in$0.40 out262k99.6% up
- Parasailfp8$0.15 in$0.40 out262k99.3% up
6 more hostsFewer hosts
- io.net$0.36 in$1.09 out262k99.3% up
- SambaNova$0.38 in$1.15 out262k98.5% up
- ModelRunfp4$0.75 in$1.00 out262k99% up
- Chutesfp4Degraded on OpenRouter when checked, 6 Oct 2026$0.12 in$0.37 out131k94% up
- Novitabf16Degraded on OpenRouter when checked, 6 Oct 2026$0.14 in$0.40 out262k82.3% up
- SiliconFlowfp8Degraded on OpenRouter when checked, 6 Oct 2026$0.75 in$1.00 out262k75.2% up
Per million tokens. Prices and uptime via OpenRouter, checked 6 Oct 2026.
Common questions
What is the difference between OpenAI Codex Mini and Gemma 4 31B?
OpenAI Codex Mini is developed by OpenAI while Gemma 4 31B is developed by Google AI. OpenAI Codex Mini has a 200K token context window vs Gemma 4 31B's 262K. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.
Which is better, OpenAI Codex Mini or Gemma 4 31B?
It depends on your use case. OpenAI Codex Mini and Gemma 4 31B each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 7 challenges so you can judge which fits your needs best.
How much does OpenAI Codex Mini cost compared to Gemma 4 31B?
OpenAI Codex Mini costs $1.5/M input tokens and Gemma 4 31B costs $0.14/M input tokens. Gemma 4 31B 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 Gemma 4 31B on Rival?
This page shows a side-by-side comparison of OpenAI Codex Mini and Gemma 4 31B 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
Against the newest arrivals
- OpenAI Codex Mini vs Ling 3.1 FlashLanded Oct 2026
- Gemma 4 31B vs Mistral Large 4Landed Oct 2026
- OpenAI Codex Mini vs GPT-6.1 SolLanded Sep 2026
- Gemma 4 31B vs Claude Sonnet 5.5Landed Sep 2026
- OpenAI Codex Mini vs Solar Mini 4Landed Sep 2026
- Gemma 4 31B vs Qwen3.8 Max PrimeLanded Sep 2026
- OpenAI Codex Mini vs GLM 5.3 PrimeLanded Sep 2026
- Gemma 4 31B vs Qwen3.8 Omni FlashLanded Sep 2026
Same lab, same size, long tail
- OpenAI Codex Mini vs GPT-6 Luna ProSame lab
- OpenAI Codex Mini vs GPT-6 Sol ProSame lab
- Gemma 4 31B vs Gemini 3.8 FlashSame lab
- Gemma 4 31B vs Gemini 3.7 FlashSame lab
- Gemma 4 31B vs Mistral Large 3 2512Same size
- OpenAI Codex Mini vs Mistral Large 4New provider
- Gemma 4 31B vs Mistral Medium 3New provider
- Gemma 4 31B vs Mistral Medium 3.1New provider
