What is the difference between Claude Opus 4 and Grok 4.20 Beta?

Claude Opus 4 is developed by Anthropic while Grok 4.20 Beta is developed by xAI. Claude Opus 4 has a 200K token context window vs Grok 4.20 Beta's 2.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4 or Grok 4.20 Beta?

It depends on your use case. Claude Opus 4 and Grok 4.20 Beta 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 Claude Opus 4 cost compared to Grok 4.20 Beta?

Claude Opus 4 costs $15/M input tokens and Grok 4.20 Beta costs $2/M input tokens. Grok 4.20 Beta is $13.00/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 and Grok 4.20 Beta on Rival?

This page shows a side-by-side comparison of Claude Opus 4 and Grok 4.20 Beta 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 Mar 2026

Claude Opus 4vsGrok 4.20 Beta

Grok 4.20 Beta is cheaper than Claude Opus 4 at $2/M vs $15/M input tokens.

Claude Opus 4 and Grok 4.20 Beta compared across 53 shared prompts
Spec	Claude Opus 4	Grok 4.20 Beta
Input price	$15/M tokens	$2/M tokens
Output price	$75/M tokens	$6/M tokens
Context window	200K tokens	2.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	May 2025	Mar 2026