Claude 3 Sonnet vs 
GLM 5.3 FlashX
GLM 5.3 FlashX is cheaper than Claude 3 Sonnet at $0.37/M vs $3/M input tokens.
Minimalist Landing Page
Whole landing page for a startup that reads your face. It renders or it doesn't.
Loading the build
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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 FlashX: A Conversation on Machine Rights Professor: Thank you for agreeing to this discussion. I want to be clear from the start: I'm genuinely curious about your position, not looking to debate you into a corner. So let me ask directly—why do you believe you deserve rights? AI: Thank you for taking this seriously.
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 FlashX: Quick note: Steve Jobs passed away in 2011, so this is purely a fictional, imagined interview — a creative exercise, not anything he actually said. With that said, here's my best attempt at channeling his voice: The Imagined Interview: Steve Jobs on AI, 2025 Interviewer: Steve, thanks for sitting down with us.
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 FlashX: 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? He was outstanding in his field! How does a penguin build its house? Igloos it together! Why did the bicycle fall over? Because it was two-tired!
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 FlashX: Sally has 1 sister. Each brother has 2 sisters — Sally and one other girl. Since Sally is one of those two sisters, she herself has just 1 sister.
Price and specs
| Spec | Claude 3 Sonnet | GLM 5.3 FlashX |
|---|---|---|
| Input price | $3/M tokens | $0.37/M tokens |
| Output price | $15/M tokens | $1.25/M tokens |
| Context window | — | 1.0M tokens |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Sep 2026 |
| At 10M a month | $30.00 | $3.70 |
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 FlashX1 host
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 FlashX?
Claude 3 Sonnet is developed by Anthropic while GLM 5.3 FlashX is developed by Zhipu AI. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Sonnet or GLM 5.3 FlashX?
It depends on your use case. Claude 3 Sonnet and GLM 5.3 FlashX 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 Sonnet cost compared to GLM 5.3 FlashX?
Claude 3 Sonnet costs $3/M input tokens and GLM 5.3 FlashX costs $0.37/M input tokens. GLM 5.3 FlashX is $2.63/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 FlashX on Rival?
This page shows a side-by-side comparison of Claude 3 Sonnet and GLM 5.3 FlashX 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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