Claude Fable 5.1 vs 
Cypher Alpha (free)
Claude Fable 5.1 is the newer model, released after Cypher Alpha (free).
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
Loading the build
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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, newer, bigger context window, major provider backing.
| Spec | Claude Fable 5.1 | Cypher Alpha (free) |
|---|---|---|
| Input price | $10/M tokens | — |
| Output price | $50/M tokens | — |
| Context window | 1.0M tokens | — |
| Weights | Closed | — |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Jul 2025 |
| At 10M a month | $100 | not listed |
Input tokens at list price. No caching, no batch discount.
Where to run it
Cypher Alpha (free)
No hosts listed on OpenRouter.
Per million tokens. Prices and uptime via OpenRouter, checked 13 Oct 2026.
Common questions
What is the difference between Claude Fable 5.1 and Cypher Alpha (free)?
Claude Fable 5.1 is developed by Anthropic while Cypher Alpha (free) is developed by OpenRouter. You can compare their actual outputs across 3 challenges on Rival to see how they differ in practice.
Which is better, Claude Fable 5.1 or Cypher Alpha (free)?
It depends on your use case. Claude Fable 5.1 and Cypher Alpha (free) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 3 challenges so you can judge which fits your needs best.
How can I compare Claude Fable 5.1 and Cypher Alpha (free) on Rival?
This page shows a side-by-side comparison of Claude Fable 5.1 and Cypher Alpha (free) 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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