What is the difference between Claude 3 Opus and GPT-5?

Claude 3 Opus is developed by Anthropic while GPT-5 is developed by OpenAI. Claude 3 Opus has a 200K token context window vs GPT-5's 400K. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

Which is better, Claude 3 Opus or GPT-5?

It depends on your use case. Claude 3 Opus and GPT-5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

How much does Claude 3 Opus cost compared to GPT-5?

Claude 3 Opus costs $15/M input tokens and GPT-5 costs $1.25/M input tokens. GPT-5 is $13.75/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 3 Opus and GPT-5 on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and GPT-5 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 Aug 2025

Claude 3 OpusvsGPT-5

GPT-5 is cheaper than Claude 3 Opus at $1.25/M vs $15/M input tokens.

Claude 3 Opus and GPT-5 compared across 12 shared prompts
Spec	Claude 3 Opus	GPT-5
Input price	$15/M tokens	$1.25/M tokens
Output price	$75/M tokens	$10/M tokens
Context window	200K tokens	400K tokens
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Mar 2024	Aug 2025