OpenCraft

Model comparison

Claude Fable 5.1 vs Claude Opus 5.5

Compare pricing, context windows and capabilities from OpenRouter. Open either model’s page to check availability and try it online.

anthropicClaude Fable 5.1newanthropic/claude-fable-5.1anthropicClaude Opus 5.5newanthropic/claude-opus-5.5
Input price /M$10.00$4.002.5× cheaper
Output price /M$50.00$20.002.5× cheaper
Cache read /M$0.25$0.201.3× cheaper
Context window1M1M
Catalog date1 Sept 202622 Sept 20261 mo newer

What the same turn costs

Estimates from published token rates — stated token counts, not measurements.

Quick answer2K tokens in, 600 outClaude Fable 5.1$0.05Claude Opus 5.5$0.022.5× cheaper
10-slide deck build60K tokens in, 9K outClaude Fable 5.1$1.05Claude Opus 5.5$0.422.5× cheaper
150-page PDF read200K tokens in, 4K outClaude Fable 5.1$2.20Claude Opus 5.5$0.882.5× cheaper

Capabilities

Bothtool-usevisionreasoning

Claude Fable 5.1: text, image, file → text · Claude Opus 5.5: text, image, file → text

Which model should you use?

Start with the token cost for your workload, the context you need, and supported input types. A lower price or larger context window does not establish better answer quality.

To compare answers, open each model in a separate chat and use the same prompt. Token tables use published specs and estimates; any measured AA results above are a separate benchmark.

Try Claude Fable 5.1 — pricing and availabilityTry Claude Opus 5.5 — pricing and availability