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

Both are developed by Anthropic but target different use cases. Claude Opus 5 has a 1.0M token context window vs Claude Sonnet 5's 1.0M. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

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

It depends on your use case. Claude Opus 5 and Claude Sonnet 5 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 much does Claude Opus 5 cost compared to Claude Sonnet 5?

Claude Opus 5 costs $5/M input tokens and Claude Sonnet 5 costs $2/M input tokens. Claude Sonnet 5 is $3.00/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 5 and Claude Sonnet 5 on Rival?

This page shows a side-by-side comparison of Claude Opus 5 and Claude Sonnet 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 5vsClaude Sonnet 5

Claude Sonnet 5 is cheaper than Claude Opus 5 at $2/M vs $5/M input tokens.

Claude Opus 5 and Claude Sonnet 5 compared across 54 shared prompts
Spec	Claude Opus 5	Claude Sonnet 5
Input price	$5/M tokens	$2/M tokens
Output price	$25/M tokens	$10/M tokens
Context window	1.0M tokens	1.0M tokens
Weights	Closed	Closed
Free API (OpenRouter)	No	No
Released	Jul 2026	Jun 2026