Claude 3 Sonnet vs 
GLM 5.3 Prime
GLM 5.3 Prime is cheaper than Claude 3 Sonnet at $2.8/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
1 promptThree 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 Prime: Sally has 1 sister. Here's why: Sally's 3 brothers each have 2 sisters. Those 2 sisters must be Sally and one other girl (since all the brothers share the same siblings). So Sally has 3 brothers and 1 sister.
Price and specs
| Spec | Claude 3 Sonnet | GLM 5.3 Prime |
|---|---|---|
| Input price | $3/M tokens | $2.8/M tokens |
| Output price | $15/M tokens | $8.8/M tokens |
| Context window | — | 1.0M tokens |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Sep 2026 |
| At 10M a month | $30.00 | $28.00 |
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 Prime1 host
Per million tokens. Prices and uptime via OpenRouter, checked 28 Sep 2026.
Common questions
What is the difference between Claude 3 Sonnet and GLM 5.3 Prime?
Claude 3 Sonnet is developed by Anthropic while GLM 5.3 Prime is developed by Z.ai. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Sonnet or GLM 5.3 Prime?
It depends on your use case. Claude 3 Sonnet and GLM 5.3 Prime 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 Claude 3 Sonnet cost compared to GLM 5.3 Prime?
Claude 3 Sonnet costs $3/M input tokens and GLM 5.3 Prime costs $2.8/M input tokens. GLM 5.3 Prime is $0.20/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 Prime on Rival?
This page shows a side-by-side comparison of Claude 3 Sonnet and GLM 5.3 Prime 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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