Claude Fable 5.1 vs Claude Sonnet 5.5
Claude Sonnet 5.5 is cheaper than Claude Fable 5.1 at $2/M vs $10/M input tokens.
Pokémon Battle UI Recreation
Pokémon battle screen you can actually click. One HTML file.
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. Claude Sonnet 5.5 costs 5.0x less per token.
| Spec | Claude Fable 5.1 | Claude Sonnet 5.5 |
|---|---|---|
| Input price | $10/M tokens | $2/M tokens |
| Output price | $50/M tokens | $10/M tokens |
| Context window | 1.0M tokens | 1.0M tokens |
| Weights | Closed | Closed |
| Free API (OpenRouter) | No | No |
| Released | Sep 2026 | Sep 2026 |
| At 10M a month | $100 | $20.00 |
Input tokens at list price. No caching, no batch discount.
Where to run it
Per million tokens. Prices and uptime via OpenRouter, checked 29 Sep 2026.
Common questions
What is the difference between Claude Fable 5.1 and Claude Sonnet 5.5?
Both are developed by Anthropic but target different use cases. Claude Fable 5.1 has a 1.0M token context window vs Claude Sonnet 5.5's 1.0M. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.
Which is better, Claude Fable 5.1 or Claude Sonnet 5.5?
It depends on your use case. Claude Fable 5.1 and Claude Sonnet 5.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.
How much does Claude Fable 5.1 cost compared to Claude Sonnet 5.5?
Claude Fable 5.1 costs $10/M input tokens and Claude Sonnet 5.5 costs $2/M input tokens. Claude Sonnet 5.5 is $8.00/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 Claude Sonnet 5.5 on Rival?
This page shows a side-by-side comparison of Claude Fable 5.1 and Claude Sonnet 5.5 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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