What is the difference between Claude Opus 4 and Grok 3 Thinking?

Claude Opus 4 is developed by Anthropic while Grok 3 Thinking is developed by xAI. Claude Opus 4 has a 200K token context window vs Grok 3 Thinking's 128K. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4 or Grok 3 Thinking?

It depends on your use case. Claude Opus 4 and Grok 3 Thinking each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 13 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4 and Grok 3 Thinking on Rival?

This page shows a side-by-side comparison of Claude Opus 4 and Grok 3 Thinking 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 May 2025

Claude Opus 4vsGrok 3 Thinking

Claude Opus 4 has a larger context window than Grok 3 Thinking (200K tokens vs 128K tokens).

Claude Opus 4 and Grok 3 Thinking compared across 13 shared prompts
Spec	Claude Opus 4	Grok 3 Thinking
Input price	$15/M tokens	—
Output price	$75/M tokens	—
Context window	200K tokens	128K tokens
Weights	Closed	—
Free API (OpenRouter)	No	—
Released	May 2025	Feb 2025
GPQA Diamond	74.9% (w/o extended thinking)	84.6%