What is the difference between Llama 3.1 405B and Muse Spark 1.3 Contributor?

Both are developed by Meta AI but target different use cases. Llama 3.1 405B has a 128K token context window vs Muse Spark 1.3 Contributor's 1.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Llama 3.1 405B or Muse Spark 1.3 Contributor?

It depends on your use case. Llama 3.1 405B and Muse Spark 1.3 Contributor each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does Llama 3.1 405B cost compared to Muse Spark 1.3 Contributor?

Llama 3.1 405B costs $2.7/M input tokens and Muse Spark 1.3 Contributor costs $0.1/M input tokens. Muse Spark 1.3 Contributor is $2.60/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 Llama 3.1 405B and Muse Spark 1.3 Contributor on Rival?

This page shows a side-by-side comparison of Llama 3.1 405B and Muse Spark 1.3 Contributor 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

Llama 3.1 405BvsMuse Spark 1.3 Contributor

Muse Spark 1.3 Contributor is cheaper than Llama 3.1 405B at $0.1/M vs $2.7/M input tokens.

Llama 3.1 405B and Muse Spark 1.3 Contributor compared across 12 shared prompts
Spec	Llama 3.1 405B	Muse Spark 1.3 Contributor
Input price	$2.7/M tokens	$0.1/M tokens
Output price	$3.1/M tokens	$0.2/M tokens
Context window	128K tokens	1.0M tokens
Weights	Open	Closed
Free API (OpenRouter)	No	No
Released	Jul 2024	Sep 2026

Our Verdict

Llama 3.1 405B

Muse Spark 1.3 Contributor

Not enough votes to call it. On the specs, nothing separates them.

Muse Spark 1.3 Contributor costs 16x less per token.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Llama 3.1 405B

Input

$2.70

Output

$3.10

Muse Spark 1.3 Contributor

Input

$0.10

27× cheaper

Output

$0.20

16× cheaper

Muse Spark 1.3 Contributor is cheaper on both: 27× input, 16× output.

Where to run it

1 host

Llama 3.1 405B

No hosts listed on OpenRouter.

Muse Spark 1.3 Contributor1 host

HostInOutContextUptime

Meta$0.10 in$0.20 out1M100% up

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

Writing DNA

Style Comparison

Similarity

43%

Muse Spark 1.3 Contributor uses 278.3x more bold

Llama 3.1 405B

Muse Spark 1.3 Contributor

55%Vocabulary58%

15wSentence Length13w

0.41Hedging0.27

0.0Bold2.8

1.9Lists2.3

0.03Emoji0.00

0.00Headings0.44

0.16Transitions0.02

Based on 5 + 27 text responses

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

More comparisons

Cost per 1M tokens

1 host

Style Comparison

What we learned reading every model

Common questions

What is the difference between Llama 3.1 405B and Muse Spark 1.3 Contributor?

Which is better, Llama 3.1 405B or Muse Spark 1.3 Contributor?

How much does Llama 3.1 405B cost compared to Muse Spark 1.3 Contributor?

How can I compare Llama 3.1 405B and Muse Spark 1.3 Contributor on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages

Cost per 1M tokens

1 host

Style Comparison

What we learned reading every model

Common questions

What is the difference between Llama 3.1 405B and Muse Spark 1.3 Contributor?

Which is better, Llama 3.1 405B or Muse Spark 1.3 Contributor?

How much does Llama 3.1 405B cost compared to Muse Spark 1.3 Contributor?

How can I compare Llama 3.1 405B and Muse Spark 1.3 Contributor on Rival?

More comparisons

Against the newest arrivals

Same lab, same size, long tail

Model pages