What is the difference between Claude Opus 4.5 and GPT-4.5?

Claude Opus 4.5 is developed by Anthropic while GPT-4.5 is developed by OpenAI. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or GPT-4.5?

It depends on your use case. Claude Opus 4.5 and GPT-4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.5 and GPT-4.5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and GPT-4.5 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 4.5 and GPT-4.5?

Claude Opus 4.5 is developed by Anthropic while GPT-4.5 is developed by OpenAI. You can compare their actual outputs across 25 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or GPT-4.5?

It depends on your use case. Claude Opus 4.5 and GPT-4.5 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 25 challenges so you can judge which fits your needs best.

How can I compare Claude Opus 4.5 and GPT-4.5 on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and GPT-4.5 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 4.5 vs GPT-4.5: Which Is Better?

Updated Nov 2025

Our Verdict

Claude Opus 4.5

GPT-4.5

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

GPT-4.5

Input

$75.00

Output

$150.00

Writing DNA

Style Comparison

Similarity

57%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5

GPT-4.5

64%Vocabulary63%

55wSentence Length16w

0.86Hedging0.57

5.8Bold4.7

4.5Lists6.4

0.15Emoji0.00

1.59Headings1.30

0.05Transitions0.54

Based on 24 + 11 text responses

Research

What we learned reading every model

Claude Opus 4.5 and GPT-4.5 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-4.5 vs MiniMax M3New provider

Claude Opus 4.5 vs Llama 4 MaverickNew provider

Claude Opus 4.5 vs GPT-5Cross-provider

Updated Nov 2025

Our Verdict

Claude Opus 4.5

GPT-4.5

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

GPT-4.5

Input

$75.00

Output

$150.00

Writing DNA

Style Comparison

Similarity

57%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5

GPT-4.5

64%Vocabulary63%

55wSentence Length16w

0.86Hedging0.57

5.8Bold4.7

4.5Lists6.4

0.15Emoji0.00

1.59Headings1.30

0.05Transitions0.54

Based on 24 + 11 text responses

Research

What we learned reading every model

Claude Opus 4.5 and GPT-4.5 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-4.5 vs MiniMax M3New provider

Claude Opus 4.5 vs Llama 4 MaverickNew provider

Claude Opus 4.5 vs GPT-5Cross-provider