What is the difference between Claude Fable 5.1 and Grok 3 Beta?

Claude Fable 5.1 is developed by Anthropic while Grok 3 Beta is developed by xAI. Claude Fable 5.1 has a 1.0M token context window vs Grok 3 Beta's 131K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5.1 or Grok 3 Beta?

It depends on your use case. Claude Fable 5.1 and Grok 3 Beta each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does Claude Fable 5.1 cost compared to Grok 3 Beta?

Claude Fable 5.1 costs $10/M input tokens and Grok 3 Beta costs $2/M input tokens. Grok 3 Beta is $8.00/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 Fable 5.1 and Grok 3 Beta on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and Grok 3 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 Sep 2026

Claude Fable 5.1vsGrok 3 Beta

Grok 3 Beta is cheaper than Claude Fable 5.1 at $2/M vs $10/M input tokens.

Claude Fable 5.1 and Grok 3 Beta compared across 10 shared prompts
Spec	Claude Fable 5.1	Grok 3 Beta
Input price	$10/M tokens	$2/M tokens
Output price	$50/M tokens	$4/M tokens
Context window	1.0M tokens	131K tokens
Weights	Closed	—
Free API (OpenRouter)	No	No
Released	Sep 2026	Apr 2025