What is the difference between Claude Opus 5 and Claude Sonnet 4?

Both are developed by Anthropic but target different use cases. Claude Opus 5 has a 1.0M token context window vs Claude Sonnet 4's 200K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Claude Sonnet 4?

It depends on your use case. Claude Opus 5 and Claude Sonnet 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 much does Claude Opus 5 cost compared to Claude Sonnet 4?

Claude Opus 5 costs $5/M input tokens and Claude Sonnet 4 costs $3/M input tokens. Claude Sonnet 4 is $2.00/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 4 on Rival?

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

What is the difference between Claude Opus 5 and Claude Sonnet 4?

Both are developed by Anthropic but target different use cases. Claude Opus 5 has a 1.0M token context window vs Claude Sonnet 4's 200K. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 5 or Claude Sonnet 4?

It depends on your use case. Claude Opus 5 and Claude Sonnet 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 much does Claude Opus 5 cost compared to Claude Sonnet 4?

Claude Opus 5 costs $5/M input tokens and Claude Sonnet 4 costs $3/M input tokens. Claude Sonnet 4 is $2.00/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 4 on Rival?

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

Claude Opus 5 vs Claude Sonnet 4: Which Is Better?

Updated Jul 2026

Our Verdict

Claude Opus 5

Claude Sonnet 4Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Claude Sonnet 4

Input

$3.00

1.7× cheaper

Output

$15.00

1.7× cheaper

Claude Sonnet 4 is cheaper on both — 1.7× input, 1.7× output

Writing DNA

Style Comparison

Similarity

34%

Claude Sonnet 4 uses 51.4x more emoji

Claude Opus 5

Claude Sonnet 4

54%Vocabulary62%

21wSentence Length111w

0.40Hedging0.40

3.9Bold5.0

1.9Lists9.3

0.02Emoji0.88

0.71Headings2.16

0.05Transitions0.33

Based on 27 + 17 text responses

Research

What we learned reading every model

Claude Opus 5 and Claude Sonnet 4 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Claude Sonnet 4 vs MiniMax M3New provider

Claude Opus 5 vs GPT-5New provider

Claude Opus 5 vs Claude Opus 4Version compare

Updated Jul 2026

Our Verdict

Claude Opus 5

Claude Sonnet 4Runner-up

No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window.

Slight edge

API pricing

Cost per 1M tokens

Claude Opus 5

Input

$5.00

Output

$25.00

Claude Sonnet 4

Input

$3.00

1.7× cheaper

Output

$15.00

1.7× cheaper

Claude Sonnet 4 is cheaper on both — 1.7× input, 1.7× output

Writing DNA

Style Comparison

Similarity

34%

Claude Sonnet 4 uses 51.4x more emoji

Claude Opus 5

Claude Sonnet 4

54%Vocabulary62%

21wSentence Length111w

0.40Hedging0.40

3.9Bold5.0

1.9Lists9.3

0.02Emoji0.88

0.71Headings2.16

0.05Transitions0.33

Based on 27 + 17 text responses

Research

What we learned reading every model

Claude Opus 5 and Claude Sonnet 4 have opinions about your brand too.Ask 10 models what they tell people about you. Verbatim receipts.Run the mirror

FAQ

Common questions

Keep exploring

More comparisons

Claude Sonnet 4 vs MiniMax M3New provider

Claude Opus 5 vs GPT-5New provider

Claude Opus 5 vs Claude Opus 4Version compare