OpenAI Codex Mini vs 
GLM 5.3
GLM 5.3 is cheaper than OpenAI Codex Mini at $0.6538/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.
GLM 5.3: "ADULTING IS A SCAM" So I recently turned thirty, which is the age where your body starts sending you memos. Last month I bent over to tie my shoe and my back went out. My back. I didn't even do anything! I wasn't lifting a couch. I was performing the most basic function of footwear.
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.
GLM 5.3: 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. I told my wife she was drawing her eyebrows too high. She looked surprised. Why don't eggs tell jokes?
Price and specs
Not enough votes to call it. On the specs, GLM 5.3 has the edge: bigger model tier, newer, bigger context window.
| Spec | OpenAI Codex Mini | GLM 5.3 |
|---|---|---|
| Input price | $1.5/M tokens | $0.6538/M tokens |
| Output price | $6/M tokens | $2.0548/M tokens |
| Context window | 200K tokens | 1.3M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Aug 2026 |
| At 10M a month | $15.00 | $6.54 |
Input tokens at list price. No caching, no batch discount.
Where to run it
OpenAI Codex Mini
No hosts listed on OpenRouter.
GLM 5.331 hosts
- Relace$0.13 in$4.00 out1M99.8% up
- Morphfp8$0.14 in$2.69 out1M99.9% up
- Wafer$0.18 in$4.40 out1M99.8% up
- Reka$0.37 in$1.14 out262k99.9% up
- DeepInfrafp4$0.56 in$2.50 out1M99.4% up
- AtlasCloudfp8$0.60 in$1.89 out1M100% up
25 more hostsFewer hosts
- SiliconFlowfp8$0.70 in$2.20 out1M99.6% up
- Novitafp8$0.78 in$2.46 out1M100% up
- Phala$0.84 in$2.64 out1M99.7% up
- Makorafp4$0.85 in$3.93 out980k98.9% up
- DigitalOcean$0.91 in$2.86 out1M99.7% up
- GMI Cloudfp8$0.98 in$3.08 out1M98.9% up
- AkashMLfp8$1.05 in$3.56 out1M100% up
- Alibaba Cloud$1.19 in$3.74 out1M99.7% up
- Decartfp4$1.19 in$3.74 out1M99% up
- Friendli$1.26 in$3.96 out1M99.9% up
- Basetenfp4$1.40 in$4.40 out1M99.9% up
- Cloudflare Workers AI$1.40 in$4.40 out1M99.4% up
- Crusoefp4$1.40 in$4.40 out1M99.8% up
- Fireworks$1.40 in$4.40 out1M99.1% up
- Mistralnvfp4$1.40 in$4.40 out1M99.9% up
- Modal$1.40 in$4.40 out1M98.8% up
- Parasailfp8$1.40 in$4.40 out1M99.9% up
- PrimeIntellect$1.40 in$4.40 out1M100% up
- Venice$1.40 in$4.40 out1M99.4% up
- Z.aifp8$1.40 in$4.40 out1M99.7% up
- InferenceNetDegraded on OpenRouter when checked, 30 Sep 2026$0.20 in$3.40 out1M99.1% up
- Sail Researchfp8Degraded on OpenRouter when checked, 30 Sep 2026$0.20 in$3.40 out1M99.5% up
- Baidu Qianfanfp8Degraded on OpenRouter when checked, 30 Sep 2026$0.29 in$0.92 out1M98% up
- Inceptronfp4Degraded on OpenRouter when checked, 30 Sep 2026$0.60 in$3.39 out1M99.4% up
- TogetherDegraded on OpenRouter when checked, 30 Sep 2026$1.40 in$4.40 out1M98.2% up
Per million tokens. Prices and uptime via OpenRouter, checked 30 Sep 2026.
Common questions
What is the difference between OpenAI Codex Mini and GLM 5.3?
OpenAI Codex Mini is developed by OpenAI while GLM 5.3 is developed by Zhipu AI. OpenAI Codex Mini has a 200K token context window vs GLM 5.3's 1.3M. 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 GLM 5.3?
It depends on your use case. OpenAI Codex Mini and GLM 5.3 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 GLM 5.3?
OpenAI Codex Mini costs $1.5/M input tokens and GLM 5.3 costs $0.6538/M input tokens. GLM 5.3 is $0.85/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 GLM 5.3 on Rival?
This page shows a side-by-side comparison of OpenAI Codex Mini and GLM 5.3 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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