What is the difference between Claude Opus 4 and GPT-5 Pro?

Claude Opus 4 is developed by Anthropic while GPT-5 Pro is developed by OpenAI. Claude Opus 4 has a 200K token context window vs GPT-5 Pro's 400K. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4 or GPT-5 Pro?

It depends on your use case. Claude Opus 4 and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

How much does Claude Opus 4 cost compared to GPT-5 Pro?

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

This page shows a side-by-side comparison of Claude Opus 4 and GPT-5 Pro 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 Pro?

Claude Opus 4 is developed by Anthropic while GPT-5 Pro is developed by OpenAI. Claude Opus 4 has a 200K token context window vs GPT-5 Pro's 400K. You can compare their actual outputs across 41 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4 or GPT-5 Pro?

It depends on your use case. Claude Opus 4 and GPT-5 Pro each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 41 challenges so you can judge which fits your needs best.

How much does Claude Opus 4 cost compared to GPT-5 Pro?

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

This page shows a side-by-side comparison of Claude Opus 4 and GPT-5 Pro 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 Pro: Which Is Better?

Updated Oct 2025

Our Verdict

GPT-5 Pro

Claude Opus 4Runner-up

No community votes yet. On paper, GPT-5 Pro 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

1.6× cheaper

GPT-5 Pro

Input

$15.00

Output

$120.00

Writing DNA

Style Comparison

Similarity

41%

Claude Opus 4 uses 444.0x more bold

Claude Opus 4

GPT-5 Pro

64%Vocabulary65%

62wSentence Length15w

0.52Hedging0.32

4.4Bold0.0

9.1Lists2.9

0.11Emoji0.00

1.87Headings0.00

0.27Transitions0.01

Based on 16 + 11 text responses

Research

What we learned reading every model

Claude Opus 4 and GPT-5 Pro 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 Pro vs MiniMax M1New provider

Claude Opus 4 vs GPT-5Cross-provider

GPT-5 Pro vs Gemini 2.5 Pro Preview 06-05New provider

Updated Oct 2025

Our Verdict

GPT-5 Pro

Claude Opus 4Runner-up

No community votes yet. On paper, GPT-5 Pro 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

1.6× cheaper

GPT-5 Pro

Input

$15.00

Output

$120.00

Writing DNA

Style Comparison

Similarity

41%

Claude Opus 4 uses 444.0x more bold

Claude Opus 4

GPT-5 Pro

64%Vocabulary65%

62wSentence Length15w

0.52Hedging0.32

4.4Bold0.0

9.1Lists2.9

0.11Emoji0.00

1.87Headings0.00

0.27Transitions0.01

Based on 16 + 11 text responses

Research

What we learned reading every model

Claude Opus 4 and GPT-5 Pro 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 Pro vs MiniMax M1New provider

Claude Opus 4 vs GPT-5Cross-provider

GPT-5 Pro vs Gemini 2.5 Pro Preview 06-05New provider