What is the difference between Claude Opus 4.5 and GPT-4o (Omni)?

Claude Opus 4.5 is developed by Anthropic while GPT-4o (Omni) is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or GPT-4o (Omni)?

It depends on your use case. Claude Opus 4.5 and GPT-4o (Omni) each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 54 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.5 and GPT-4o (Omni) on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and GPT-4o (Omni) 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 Nov 2025

Claude Opus 4.5vsGPT-4o (Omni)

Claude Opus 4.5 is the newer model, released after GPT-4o (Omni).

Claude Opus 4.5 and GPT-4o (Omni) compared across 54 shared prompts
Spec	Claude Opus 4.5	GPT-4o (Omni)
Input price	—	$2.5/M tokens
Output price	—	$10/M tokens
Context window	—	128K tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Nov 2025	May 2024