What is the difference between Claude 3 Opus and Claude Opus 4.1?

Both are developed by Anthropic but target different use cases. Claude 3 Opus has a 200K token context window vs Claude Opus 4.1's 200K. 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 Claude Opus 4.1?

It depends on your use case. Claude 3 Opus and Claude Opus 4.1 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 Claude Opus 4.1?

Claude 3 Opus costs $15/M input tokens and Claude Opus 4.1 costs $15/M input tokens. Claude Opus 4.1 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 3 Opus and Claude Opus 4.1 on Rival?

This page shows a side-by-side comparison of Claude 3 Opus and Claude Opus 4.1 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 OpusvsClaude Opus 4.1

Claude Opus 4.1 is the newer model, released after Claude 3 Opus.

Claude 3 Opus and Claude Opus 4.1 compared across 12 shared prompts
Spec	Claude 3 Opus	Claude Opus 4.1
Input price	$15/M tokens	$15/M tokens
Output price	$75/M tokens	$75/M tokens
Context window	200K tokens	200K tokens
Parameters	Not disclosed	Not disclosed
Weights	—	Closed
Free API (OpenRouter)	No	No
Released	Mar 2024	Aug 2025