Claude Fable 5.1 vs 
GLM 5.3 Prime
GLM 5.3 Prime is cheaper than Claude Fable 5.1 at $2.8/M vs $10/M input tokens.
Mario Level UI Recreation
Playable Mario level in one HTML file. The physics is the hard part.
Loading the build
Loading the build
Which answer wins?
Price and specs
Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: bigger model tier, major provider backing. GLM 5.3 Prime costs 5.7x less per token.
| Spec | Claude Fable 5.1 | GLM 5.3 Prime |
|---|---|---|
| Input price | $10/M tokens | $2.8/M tokens |
| Output price | $50/M tokens | $8.8/M tokens |
| Context window | 1.0M tokens | 1.0M tokens |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Sep 2026 |
| At 10M a month | $100 | $28.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
GLM 5.3 Prime1 host
Per million tokens. Prices and uptime via OpenRouter, checked 29 Sep 2026.
Common questions
What is the difference between Claude Fable 5.1 and GLM 5.3 Prime?
Claude Fable 5.1 is developed by Anthropic while GLM 5.3 Prime is developed by Z.ai. Claude Fable 5.1 has a 1.0M token context window vs GLM 5.3 Prime's 1.0M. You can compare their actual outputs across 5 challenges on Rival to see how they differ in practice.
Which is better, Claude Fable 5.1 or GLM 5.3 Prime?
It depends on your use case. Claude Fable 5.1 and GLM 5.3 Prime each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 5 challenges so you can judge which fits your needs best.
How much does Claude Fable 5.1 cost compared to GLM 5.3 Prime?
Claude Fable 5.1 costs $10/M input tokens and GLM 5.3 Prime costs $2.8/M input tokens. GLM 5.3 Prime is $7.20/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 Fable 5.1 and GLM 5.3 Prime on Rival?
This page shows a side-by-side comparison of Claude Fable 5.1 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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Same lab, same size, long tail
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