What is the difference between Claude Opus 4.5 and OpenAI o4 Mini High?

Claude Opus 4.5 is developed by Anthropic while OpenAI o4 Mini High is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or OpenAI o4 Mini High?

It depends on your use case. Claude Opus 4.5 and OpenAI o4 Mini High 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 can I compare Claude Opus 4.5 and OpenAI o4 Mini High on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and OpenAI o4 Mini High 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 OpenAI o4 Mini High?

Claude Opus 4.5 is developed by Anthropic while OpenAI o4 Mini High is developed by OpenAI. You can compare their actual outputs across 54 challenges on Rival to see how they differ in practice.

Which is better, Claude Opus 4.5 or OpenAI o4 Mini High?

It depends on your use case. Claude Opus 4.5 and OpenAI o4 Mini High 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 can I compare Claude Opus 4.5 and OpenAI o4 Mini High on Rival?

This page shows a side-by-side comparison of Claude Opus 4.5 and OpenAI o4 Mini High 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 OpenAI o4 Mini High: Which Is Better?

Updated Nov 2025

Our Verdict

Claude Opus 4.5

OpenAI o4 Mini HighRunner-up

No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

OpenAI o4 Mini High

Input

$1.10

Output

$4.40

Writing DNA

Style Comparison

Similarity

44%

Claude Opus 4.5 uses 580.0x more bold

Claude Opus 4.5

OpenAI o4 Mini High

64%Vocabulary70%

55wSentence Length18w

0.86Hedging0.33

5.8Bold0.0

4.5Lists1.3

0.15Emoji0.02

1.59Headings0.00

0.05Transitions0.04

Based on 24 + 14 text responses

Research

What we learned reading every model

Claude Opus 4.5 and OpenAI o4 Mini High 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

OpenAI o4 Mini High vs MiniMax M3New provider

Claude Opus 4.5 vs Grok 3New provider

Claude Opus 4.5 vs Llama 4 MaverickNew provider

Updated Nov 2025

Our Verdict

Claude Opus 4.5

OpenAI o4 Mini HighRunner-up

No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4.5

Input

—

Output

—

OpenAI o4 Mini High

Input

$1.10

Output

$4.40

Writing DNA

Style Comparison

Similarity

44%

Claude Opus 4.5 uses 580.0x more bold

Claude Opus 4.5

OpenAI o4 Mini High

64%Vocabulary70%

55wSentence Length18w

0.86Hedging0.33

5.8Bold0.0

4.5Lists1.3

0.15Emoji0.02

1.59Headings0.00

0.05Transitions0.04

Based on 24 + 14 text responses

Research

What we learned reading every model

Claude Opus 4.5 and OpenAI o4 Mini High 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

OpenAI o4 Mini High vs MiniMax M3New provider

Claude Opus 4.5 vs Grok 3New provider

Claude Opus 4.5 vs Llama 4 MaverickNew provider