What is the difference between Claude Fable 5.1 and OpenAI o4 Mini High?

Claude Fable 5.1 is developed by Anthropic while OpenAI o4 Mini High is developed by OpenAI. Claude Fable 5.1 has a 1.0M token context window vs OpenAI o4 Mini High's 200K. 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 OpenAI o4 Mini High?

It depends on your use case. Claude Fable 5.1 and OpenAI o4 Mini High 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 OpenAI o4 Mini High?

Claude Fable 5.1 costs $10/M input tokens and OpenAI o4 Mini High costs $1.1/M input tokens. OpenAI o4 Mini High is $8.90/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 OpenAI o4 Mini High on Rival?

This page shows a side-by-side comparison of Claude Fable 5.1 and OpenAI o4 Mini High 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 5.1vsOpenAI o4 Mini High

OpenAI o4 Mini High is cheaper than Claude Fable 5.1 at $1.1/M vs $10/M input tokens.

Claude Fable 5.1 and OpenAI o4 Mini High compared across 10 shared prompts
Spec	Claude Fable 5.1	OpenAI o4 Mini High
Input price	$10/M tokens	$1.1/M tokens
Output price	$50/M tokens	$4.4/M tokens
Context window	1.0M tokens	200K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Sep 2026	Apr 2025