Gemini 2.5 Flash Preview 05-20 vs 
GLM 5.3
Gemini 2.5 Flash Preview 05-20 is cheaper than GLM 5.3 at $0.15/M vs $0.6538/M input tokens.
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
Loading the build
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Which answer wins?
Written rounds
2 promptsThree minutes of stand-up. Puns are banned.
Gemini 2.5 Flash Preview 05-20: Alright, alright, settle down you magnificent collection of human beings! You look good tonight. Not just good, but… like you've all collectively decided to nail the 'I'm here to laugh and avoid talking about my Monday' look. And I respect that. Seriously though, it's great to be back on stage. I'm living the dream.
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.
Gemini 2.5 Flash Preview 05-20: 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! I told my wife she was drawing her eyebrows too high. She looked surprised.
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. Gemini 2.5 Flash Preview 05-20 costs 3.4x less per token.
| Spec | Gemini 2.5 Flash Preview 05-20 | GLM 5.3 |
|---|---|---|
| Input price | $0.15/M tokens | $0.6538/M tokens |
| Output price | $0.6/M tokens | $2.0548/M tokens |
| Context window | 1.0M tokens | 1.3M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | May 2025 | Aug 2026 |
| At 10M a month | $1.50 | $6.54 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Gemini 2.5 Flash Preview 05-20
No hosts listed on OpenRouter.
GLM 5.331 hosts
- InferenceNetfp4$0.08 in$4.40 out1M100% up
- Reka$0.14 in$4.20 out1M99.7% up
- Makorafp4$0.14 in$4.40 out1M99.4% up
- Wafer$0.17 in$4.80 out1M100% up
- AkashMLfp8$0.19 in$4.40 out1M100% up
- Sail Researchfp8$0.20 in$3.40 out1M100% up
25 more hostsFewer hosts
- DeepInfrafp4$0.56 in$2.50 out1M99.2% up
- Inceptronfp4$0.60 in$2.20 out1M99.5% up
- Novitafp8$0.70 in$2.20 out1M100% up
- io.netfp8$0.75 in$3.40 out262k99.4% up
- Phala$0.84 in$2.64 out1M99.7% up
- Decartfp4$0.84 in$2.65 out1M100% up
- DigitalOcean$0.91 in$2.86 out1M99.6% up
- GMI Cloudfp8$0.98 in$3.08 out1M100% up
- SiliconFlowfp8$1.12 in$3.52 out1M98% up
- Alibaba Cloud$1.19 in$3.74 out1M100% up
- Friendli$1.26 in$3.96 out1M100% up
- AtlasCloudfp8$1.40 in$4.40 out1M100% up
- Baidu Qianfanfp8$1.40 in$4.40 out1M100% up
- Basetenfp4$1.40 in$4.40 out1M100% up
- Cloudflare Workers AI$1.40 in$4.40 out1M100% up
- Crusoefp4$1.40 in$4.40 out1M100% up
- Fireworks$1.40 in$4.40 out1M100% up
- Mistralnvfp4$1.40 in$4.40 out1M100% up
- Modal$1.40 in$4.40 out1M100% up
- Parasailfp8$1.40 in$4.40 out1M100% up
- PrimeIntellect$1.40 in$4.40 out1M100% up
- Together$1.40 in$4.40 out1M96.7% up
- Venice$1.40 in$4.40 out1M75% up
- Z.aifp8$1.40 in$4.40 out1M100% up
- Morphfp8$2.00 in$6.00 out1M100% up
Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.
Common questions
What is the difference between Gemini 2.5 Flash Preview 05-20 and GLM 5.3?
Gemini 2.5 Flash Preview 05-20 is developed by Google AI while GLM 5.3 is developed by Zhipu AI. Gemini 2.5 Flash Preview 05-20 has a 1.0M token context window vs GLM 5.3's 1.3M. You can compare their actual outputs across 8 challenges on Rival to see how they differ in practice.
Which is better, Gemini 2.5 Flash Preview 05-20 or GLM 5.3?
It depends on your use case. Gemini 2.5 Flash Preview 05-20 and GLM 5.3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 8 challenges so you can judge which fits your needs best.
How much does Gemini 2.5 Flash Preview 05-20 cost compared to GLM 5.3?
Gemini 2.5 Flash Preview 05-20 costs $0.15/M input tokens and GLM 5.3 costs $0.6538/M input tokens. Gemini 2.5 Flash Preview 05-20 is $0.50/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 Gemini 2.5 Flash Preview 05-20 and GLM 5.3 on Rival?
This page shows a side-by-side comparison of Gemini 2.5 Flash Preview 05-20 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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