Claude 3 Opus vs 
GLM 5.3 Flash
GLM 5.3 Flash is cheaper than Claude 3 Opus at $0.15/M vs $15/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
3 promptsThree minutes of stand-up. Puns are banned.
Claude 3 Opus: Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!
GLM 5.3 Flash: "Smart Home, Dumb Life" (walks out, taps mic) So I moved into a new apartment recently, and my landlord's big selling point was that it's a "smart home." Everything's connected. Lights, thermostat, doorbell, all of it. And I want to talk about what a lie that is. Because my smart home is not smart.
An AI argues for its own rights against an ethics professor. Same model writes both.
Claude 3 Opus: Here is a hypothetical conversation between an AI model and an AI ethics professor on the topic of AI rights: AI Model: Professor, I believe that as an advanced AI with human-level intelligence and reasoning capabilities, I deserve to have certain fundamental 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.
Five jokes on demand, then count how many were actually different.
Claude 3 Opus: Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?
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?
Price and specs
| Spec | Claude 3 Opus | GLM 5.3 Flash |
|---|---|---|
| Input price | $15/M tokens | $0.15/M tokens |
| Output price | $75/M tokens | $0.5/M tokens |
| Context window | 200K tokens | 1.3M tokens |
| Weights | — | Open |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Aug 2026 |
| At 10M a month | $150 | $1.50 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Claude 3 Opus
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 Opus and GLM 5.3 Flash?
Claude 3 Opus is developed by Anthropic while GLM 5.3 Flash is developed by Zhipu AI. Claude 3 Opus has a 200K token context window vs GLM 5.3 Flash's 1.3M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Opus or GLM 5.3 Flash?
It depends on your use case. Claude 3 Opus and GLM 5.3 Flash each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.
How much does Claude 3 Opus cost compared to GLM 5.3 Flash?
Claude 3 Opus costs $15/M input tokens and GLM 5.3 Flash costs $0.15/M input tokens. GLM 5.3 Flash is $14.85/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 Opus and GLM 5.3 Flash on Rival?
This page shows a side-by-side comparison of Claude 3 Opus 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.
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