What is the difference between Grok 4.20 Beta and Muse Spark 1.3?

Grok 4.20 Beta is developed by xAI while Muse Spark 1.3 is developed by Meta AI. Grok 4.20 Beta has a 2.0M token context window vs Muse Spark 1.3's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Grok 4.20 Beta or Muse Spark 1.3?

It depends on your use case. Grok 4.20 Beta and Muse Spark 1.3 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 53 challenges so you can judge which fits your needs best.

How much does Grok 4.20 Beta cost compared to Muse Spark 1.3?

Grok 4.20 Beta costs $2/M input tokens and Muse Spark 1.3 costs $1.25/M input tokens. Muse Spark 1.3 is $0.75/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 Grok 4.20 Beta and Muse Spark 1.3 on Rival?

This page shows a side-by-side comparison of Grok 4.20 Beta 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

Grok 4.20 BetavsMuse Spark 1.3

Muse Spark 1.3 is cheaper than Grok 4.20 Beta at $1.25/M vs $2/M input tokens.

Grok 4.20 Beta and Muse Spark 1.3 compared across 53 shared prompts
Spec	Grok 4.20 Beta	Muse Spark 1.3
Input price	$2/M tokens	$1.25/M tokens
Output price	$6/M tokens	$4.25/M tokens
Context window	2.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Mar 2026	Sep 2026