What is the difference between Claude Opus 4.1 and Claude Opus 5?

Both are developed by Anthropic but target different use cases. Claude Opus 4.1 has a 200K token context window vs Claude Opus 5's 1.0M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.1 or Claude Opus 5?

It depends on your use case. Claude Opus 4.1 and Claude Opus 5 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 Opus 4.1 cost compared to Claude Opus 5?

Claude Opus 4.1 costs $15/M input tokens and Claude Opus 5 costs $5/M input tokens. Claude Opus 5 is $10.00/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 Opus 4.1 and Claude Opus 5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.1 and Claude Opus 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 Jul 2026

Claude Opus 4.1vsClaude Opus 5

Claude Opus 5 is cheaper than Claude Opus 4.1 at $5/M vs $15/M input tokens.

Claude Opus 4.1 and Claude Opus 5 compared across 53 shared prompts
Spec	Claude Opus 4.1	Claude Opus 5
Input price	$15/M tokens	$5/M tokens
Output price	$75/M tokens	$25/M tokens
Context window	200K tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Aug 2025	Jul 2026