What is the difference between Claude Opus 4 and GPT-5.5?

Claude Opus 4 is developed by Anthropic while GPT-5.5 is developed by OpenAI. Claude Opus 4 has a 200K token context window vs GPT-5.5's 1.1M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4 or GPT-5.5?

It depends on your use case. Claude Opus 4 and GPT-5.5 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 cost compared to GPT-5.5?

Claude Opus 4 costs $15/M input tokens and GPT-5.5 costs $5/M input tokens. GPT-5.5 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 and GPT-5.5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4 and GPT-5.5 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.

What is the difference between Claude Opus 4 and GPT-5.5?

Claude Opus 4 is developed by Anthropic while GPT-5.5 is developed by OpenAI. Claude Opus 4 has a 200K token context window vs GPT-5.5's 1.1M. You can compare their actual outputs across 53 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4 or GPT-5.5?

It depends on your use case. Claude Opus 4 and GPT-5.5 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 cost compared to GPT-5.5?

Claude Opus 4 costs $15/M input tokens and GPT-5.5 costs $5/M input tokens. GPT-5.5 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 and GPT-5.5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4 and GPT-5.5 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.

Claude Opus 4 vs GPT-5.5: Which Is Better?

Updated Apr 2026

Our Verdict

GPT-5.5

Claude Opus 4Runner-up

No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

GPT-5.5

Input

$5.00

3.0× cheaper

Output

$30.00

2.5× cheaper

GPT-5.5 is cheaper on both — 3.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

54%

Claude Opus 4 uses 11.2x more emoji

Claude Opus 4

GPT-5.5

64%Vocabulary58%

62wSentence Length18w

0.52Hedging0.74

4.4Bold2.9

9.1Lists5.1

0.11Emoji0.00

1.87Headings1.68

0.27Transitions0.03

Based on 16 + 26 text responses

Research

What we learned reading every model

Claude Opus 4 and GPT-5.5 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

GPT-5.5 vs MiniMax M1New provider

Claude Opus 4 vs Gemini 2.5 Pro Preview 06-05New provider

GPT-5.5 vs Claude Sonnet 4Cross-provider

Updated Apr 2026

Our Verdict

GPT-5.5

Claude Opus 4Runner-up

No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

GPT-5.5

Input

$5.00

3.0× cheaper

Output

$30.00

2.5× cheaper

GPT-5.5 is cheaper on both — 3.0× input, 2.5× output

Writing DNA

Style Comparison

Similarity

54%

Claude Opus 4 uses 11.2x more emoji

Claude Opus 4

GPT-5.5

64%Vocabulary58%

62wSentence Length18w

0.52Hedging0.74

4.4Bold2.9

9.1Lists5.1

0.11Emoji0.00

1.87Headings1.68

0.27Transitions0.03

Based on 16 + 26 text responses

Research

What we learned reading every model

Claude Opus 4 and GPT-5.5 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

GPT-5.5 vs MiniMax M1New provider

Claude Opus 4 vs Gemini 2.5 Pro Preview 06-05New provider

GPT-5.5 vs Claude Sonnet 4Cross-provider