What is the difference between Claude Fable 5.1 and Muse Spark 1.1?

Claude Fable 5.1 is developed by Anthropic while Muse Spark 1.1 is developed by Meta AI. Claude Fable 5.1 has a 1.0M token context window vs Muse Spark 1.1'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 Muse Spark 1.1?

It depends on your use case. Claude Fable 5.1 and Muse Spark 1.1 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 Muse Spark 1.1?

Claude Fable 5.1 costs $10/M input tokens and Muse Spark 1.1 costs $1.25/M input tokens. Muse Spark 1.1 is $8.75/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 Muse Spark 1.1 on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Muse Spark 1.1 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.

Updated Sep 2026

Claude Fable 5.1vsMuse Spark 1.1

Muse Spark 1.1 is cheaper than Claude Fable 5.1 at $1.25/M vs $10/M input tokens.

Claude Fable 5.1 and Muse Spark 1.1 compared across 10 shared prompts
Spec	Claude Fable 5.1	Muse Spark 1.1
Input price	$10/M tokens	$1.25/M tokens
Output price	$50/M tokens	$4.25/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Jul 2026

Our Verdict

Claude Fable 5.1

Muse Spark 1.1Runner-up

Not enough votes to call it. On the specs, Claude Fable 5.1 has the edge: bigger model tier, newer.

Muse Spark 1.1 costs 12x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude Fable 5.1

Input

$10.00

Output

$50.00

Muse Spark 1.1

Input

$1.25

8.0× cheaper

Output

$4.25

12× cheaper

Muse Spark 1.1 is cheaper on both: 8.0× input, 12× output.

Where to run it

5 hosts

Claude Fable 5.14 hosts

HostInOutContextUptime

Amazon Bedrock$10.00 in$50.00 out1M—Anthropic$10.00 in$50.00 out1M99.1% up Azure AI Foundry$10.00 in$50.00 out1M99.1% up Google Vertex AI$10.00 in$50.00 out1M99.8% up

Muse Spark 1.11 host

HostInOutContextUptime

Meta$1.25 in$4.25 out1M100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

5 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Muse Spark 1.1?

Which is better, Claude Fable 5.1 or Muse Spark 1.1?

How much does Claude Fable 5.1 cost compared to Muse Spark 1.1?

How can I compare Claude Fable 5.1 and Muse Spark 1.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

5 hosts

What we learned reading every model

Common questions

What is the difference between Claude Fable 5.1 and Muse Spark 1.1?

Which is better, Claude Fable 5.1 or Muse Spark 1.1?

How much does Claude Fable 5.1 cost compared to Muse Spark 1.1?

How can I compare Claude Fable 5.1 and Muse Spark 1.1 on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages