What is the difference between Claude Opus 4.8 and Grok 3 Mini Beta?

Claude Opus 4.8 is developed by Anthropic while Grok 3 Mini Beta is developed by xAI. Claude Opus 4.8 has a 1.0M token context window vs Grok 3 Mini Beta's 131K. You can compare their actual outputs across 13 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.8 or Grok 3 Mini Beta?

It depends on your use case. Claude Opus 4.8 and Grok 3 Mini Beta 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 much does Claude Opus 4.8 cost compared to Grok 3 Mini Beta?

Claude Opus 4.8 costs $5/M input tokens and Grok 3 Mini Beta costs $0.4/M input tokens. Grok 3 Mini Beta is $4.60/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 Claude Opus 4.8 and Grok 3 Mini Beta on Rival?

This page shows a side-by-side comparison of Claude Opus 4.8 and Grok 3 Mini 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 May 2026

Claude Opus 4.8vsGrok 3 Mini Beta

Grok 3 Mini Beta is cheaper than Claude Opus 4.8 at $0.4/M vs $5/M input tokens.

Claude Opus 4.8 and Grok 3 Mini Beta compared across 13 shared prompts
Spec	Claude Opus 4.8	Grok 3 Mini Beta
Input price	$5/M tokens	$0.4/M tokens
Output price	$25/M tokens	$0.8/M tokens
Context window	1.0M tokens	131K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	May 2026	Apr 2025