Claude 3 Opus vs 
GLM 5.3 Prime
GLM 5.3 Prime is cheaper than Claude 3 Opus at $2.8/M vs $15/M input tokens.
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Which answer wins?
Price and specs
| Spec | Claude 3 Opus | GLM 5.3 Prime |
|---|---|---|
| Input price | $15/M tokens | $2.8/M tokens |
| Output price | $75/M tokens | $8.8/M tokens |
| Context window | 200K tokens | 1.0M tokens |
| Free API (OpenRouter) | No | No |
| Released | Mar 2024 | Sep 2026 |
| At 10M a month | $150 | $28.00 |
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 Prime1 host
Per million tokens. Prices and uptime via OpenRouter, checked 28 Sep 2026.
Common questions
What is the difference between Claude 3 Opus and GLM 5.3 Prime?
Claude 3 Opus is developed by Anthropic while GLM 5.3 Prime is developed by Z.ai. Claude 3 Opus has a 200K token context window vs GLM 5.3 Prime's 1.0M. You can compare their actual outputs across 1 challenges on Rival to see how they differ in practice.
Which is better, Claude 3 Opus or GLM 5.3 Prime?
It depends on your use case. Claude 3 Opus and GLM 5.3 Prime each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 1 challenges so you can judge which fits your needs best.
How much does Claude 3 Opus cost compared to GLM 5.3 Prime?
Claude 3 Opus costs $15/M input tokens and GLM 5.3 Prime costs $2.8/M input tokens. GLM 5.3 Prime is $12.20/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 Opus and GLM 5.3 Prime on Rival?
This page shows a side-by-side comparison of Claude 3 Opus 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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