What is the difference between Claude Opus 4.8 and Muse Spark 1.3?

Claude Opus 4.8 is developed by Anthropic while Muse Spark 1.3 is developed by Meta AI. Claude Opus 4.8 has a 1.0M token context window vs Muse Spark 1.3's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or Muse Spark 1.3?

It depends on your use case. Claude Opus 4.8 and Muse Spark 1.3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How much does Claude Opus 4.8 cost compared to Muse Spark 1.3?

Claude Opus 4.8 costs $5/M input tokens and Muse Spark 1.3 costs $1.25/M input tokens. Muse Spark 1.3 is $3.75/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 Opus 4.8 and Muse Spark 1.3 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and Muse Spark 1.3 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 Opus 4.8vsMuse Spark 1.3

Muse Spark 1.3 is cheaper than Claude Opus 4.8 at $1.25/M vs $5/M input tokens.

Claude Opus 4.8 and Muse Spark 1.3 compared across 54 shared prompts
Spec	Claude Opus 4.8	Muse Spark 1.3
Input price	$5/M tokens	$1.25/M tokens
Output price	$25/M tokens	$4.25/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2026	Sep 2026