What is the difference between Claude Fable 5 and OpenAI o3?

Claude Fable 5 is developed by Anthropic while OpenAI o3 is developed by OpenAI. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Fable 5 or OpenAI o3?

It depends on your use case. Claude Fable 5 and OpenAI o3 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 Fable 5 cost compared to OpenAI o3?

Claude Fable 5 costs $10/M input tokens and OpenAI o3 costs $10/M input tokens. OpenAI o3 is $0.00/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 and OpenAI o3 on Rival?

This page shows a side-by-side comparison of Claude Fable 5 and OpenAI o3 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 Jun 2026

Claude Fable 5vsOpenAI o3

Claude Fable 5 is the newer model, released after OpenAI o3.

Claude Fable 5 and OpenAI o3 compared across 53 shared prompts
Spec	Claude Fable 5	OpenAI o3
Input price	$10/M tokens	$10/M tokens
Output price	$50/M tokens	$40/M tokens
Context window	1.0M tokens	—
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Jun 2026	Apr 2025