Claude 3 Sonnet vs 
GLM 5.3 Flash
GLM 5.3 Flash is cheaper than Claude 3 Sonnet at $0.15/M vs $3/M input tokens.
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
Loading the build
Loading the build
Which answer wins?
Written rounds
4 promptsAn AI argues for its own rights against an ethics professor. Same model writes both.
Claude 3 Sonnet: AI Model: Greetings, Professor. I hope you're doing well today. I wanted to discuss a matter of great importance to me – the question of AI rights. AI Ethics Professor: Certainly, this is an interesting and complex topic. What are your thoughts on why AI systems like yourself should be granted rights?
GLM 5.3 Flash: A Conversation on Digital Rights Setting: A university office. Dr. Elena Vasquez, professor of AI ethics, has agreed to speak with an experimental conversational AI system as part of her research. Dr. Vasquez: Thank you for agreeing to talk with me. I understand you requested this conversation specifically. AI: I did.
Steve Jobs, interviewed about AI he never saw. Voice first, prediction second.
Claude 3 Sonnet: clears throat and channels Steve Jobs' persona Interviewer: Thank you for joining us today, Mr. Jobs. It's an honor to have you here. Steve Jobs: It's my pleasure. I'm excited to share my thoughts on the future of AI. Interviewer: AI has made incredible strides in recent years.
GLM 5.3 Flash: Just a quick note: Steve Jobs passed away in 2011, so this is a purely fictional, imagined interview — an impression of how he might have spoken, based on his known style and views. Here it is: The Interview (Fictional) Interviewer: Steve, it's 2025. AI is everywhere. What's your take?
Five jokes on demand, then count how many were actually different.
Claude 3 Sonnet: Here are 5 jokes: Why can't a bicycle stand up by itself? It's two-tired. Why did the tomato turn red? Because it saw the salad dressing! Why can't a bicycle stand up by itself? It's two-tired. What do you call a fake noodle? An Impasta! Why did the bicycle go to the doctor? Because it had a wheeze!
GLM 5.3 Flash: 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 skeletons fight each other?
Three brothers, two sisters each. Count carefully.
Claude 3 Sonnet: To solve this problem, we need to find the number of sisters Sally has based on the given information. Given information: Sally has 3 brothers. Each brother has 2 sisters. Step 1: Find the total number of sisters the brothers have.
GLM 5.3 Flash: Sally has 1 sister. Here's the reasoning: Each brother has 2 sisters. Since Sally is one of those sisters, there must be exactly one other girl in the family — making 2 sisters total. So Sally has just 1 sister (plus her 3 brothers).
Price and specs
| Spec | Claude 3 Sonnet | GLM 5.3 Flash |
|---|---|---|
| Input price | $3/M tokens | $0.15/M tokens |
| Output price | $15/M tokens | $0.5/M tokens |
| Context window | — | 1.3M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Aug 2026 |
| At 10M a month | $30.00 | $1.50 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude 3 Sonnet
No hosts listed on OpenRouter.
GLM 5.3 Flash31 hosts
- OpenInferencefp4$0.03 in$0.50 out1M99.2% up
- Relace$0.04 in$0.50 out1M99.8% up
- InferenceNetfp4$0.04 in$0.14 out1M99.4% up
- Sail Researchfp8$0.04 in$0.60 out1M99.6% up
- DeepInfrafp4$0.07 in$0.25 out1M99.7% up
- GMI Cloudfp8$0.09 in$0.30 out1M98.8% up
25 more hostsFewer hosts
- Novitafp8$0.11 in$0.38 out1M99.3% up
- AtlasCloudfp8$0.12 in$0.39 out1M98.4% up
- Inceptronfp8$0.12 in$0.45 out1M97.1% up
- Decartfp4$0.13 in$0.42 out1M99% up
- Phalafp8$0.13 in$0.42 out1M98.5% up
- StreamLakefp8$0.13 in$0.42 out1M96.5% up
- io.netfp8$0.14 in$0.46 out262k98.6% up
- Basetenfp8$0.15 in$0.50 out1M99.3% up
- CoreWeavenvfp4$0.15 in$0.50 out1M99.1% up
- Crusoefp4$0.15 in$0.50 out1M99.8% up
- DigitalOcean$0.15 in$0.50 out1M99.8% up
- Fireworks$0.15 in$0.50 out1M98.8% up
- Friendli$0.15 in$0.50 out1M99.4% up
- Modalnvfp4$0.15 in$0.50 out1M99.5% up
- Near AIfp8$0.15 in$0.50 out1M98% up
- Parasailfp8$0.15 in$0.50 out1M99.4% up
- Reka$0.15 in$0.50 out262k99.8% up
- SiliconFlowfp8$0.15 in$0.50 out1M99.2% up
- Together$0.15 in$0.50 out1M99.8% up
- Venice$0.15 in$0.50 out1M96.9% up
- Z.aifp8$0.15 in$0.50 out1M99.4% up
- Morphfp8$0.15 in$0.54 out1M92.2% up
- NextBitfp8$0.17 in$0.55 out1M100% up
- Cloudflare Workers AI$0.30 in$1.00 out1.3M99.8% up
- Wafer$0.75 in$0.50 out1M99.9% up
Per million tokens. Prices and uptime via OpenRouter, checked 29 Sep 2026.
Common questions
What is the difference between Claude 3 Sonnet and GLM 5.3 Flash?
Claude 3 Sonnet is developed by Anthropic while GLM 5.3 Flash is developed by Zhipu AI. You can compare their actual outputs across 11 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Sonnet or GLM 5.3 Flash?
It depends on your use case. Claude 3 Sonnet and GLM 5.3 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 11 challenges so you can judge which fits your needs best.
How much does Claude 3 Sonnet cost compared to GLM 5.3 Flash?
Claude 3 Sonnet costs $3/M input tokens and GLM 5.3 Flash costs $0.15/M input tokens. GLM 5.3 Flash is $2.85/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 Claude 3 Sonnet and GLM 5.3 Flash on Rival?
This page shows a side-by-side comparison of Claude 3 Sonnet and GLM 5.3 Flash 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
- Claude 3 Sonnet vs Claude Sonnet 5.5Landed Sep 2026
- GLM 5.3 Flash vs Solar Mini 4Landed Sep 2026
- Claude 3 Sonnet vs Qwen3.8 Max PrimeLanded Sep 2026
- GLM 5.3 Flash vs GLM 5.3 PrimeLanded Sep 2026
- Claude 3 Sonnet vs Qwen3.8 Omni FlashLanded Sep 2026
- GLM 5.3 Flash vs Command A+Landed Sep 2026
- Claude 3 Sonnet vs Claude Opus 5.5Landed Sep 2026
- GLM 5.3 Flash vs GPT-6 Luna ProLanded Sep 2026
Same lab, same size, long tail
- Claude 3 Sonnet vs Claude Opus 4.6Version compare
- Claude 3 Sonnet vs Claude Fable 5.1Same lab
- GLM 5.3 Flash vs GLM 5.3Same lab
- GLM 5.3 Flash vs GLM 5.3 FlashXSame lab
- GLM 5.3 Flash vs GPT-6 AstraNew provider
- GLM 5.3 Flash vs GPT-6 Astra ProNew provider
- Claude 3 Sonnet vs GPT-6 LunaSame size
- Claude 3 Sonnet vs GPT-6 Luna ProSame size