What is the difference between Claude Opus 4.5 and GPT-5.4?

Claude Opus 4.5 is developed by Anthropic while GPT-5.4 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 Opus 4.5 or GPT-5.4?

It depends on your use case. Claude Opus 4.5 and GPT-5.4 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 can I compare Claude Opus 4.5 and GPT-5.4 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and GPT-5.4 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 Mar 2026

Claude Opus 4.5vsGPT-5.4

GPT-5.4 is the newer model, released after Claude Opus 4.5.

Claude Opus 4.5 and GPT-5.4 compared across 53 shared prompts
Spec	Claude Opus 4.5	GPT-5.4
Input price	—	$2.5/M tokens
Output price	—	$15/M tokens
Context window	—	1.1M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Nov 2025	Mar 2026