What is the difference between Claude Opus 4 and OpenAI o4-mini?

Claude Opus 4 is developed by Anthropic while OpenAI o4-mini is developed by OpenAI. 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 OpenAI o4-mini?

It depends on your use case. Claude Opus 4 and OpenAI o4-mini 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 OpenAI o4-mini?

Claude Opus 4 costs $15/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $13.90/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 OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of Claude Opus 4 and OpenAI o4-mini 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 OpenAI o4-mini?

Claude Opus 4 is developed by Anthropic while OpenAI o4-mini is developed by OpenAI. 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 OpenAI o4-mini?

It depends on your use case. Claude Opus 4 and OpenAI o4-mini 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 OpenAI o4-mini?

Claude Opus 4 costs $15/M input tokens and OpenAI o4-mini costs $1.1/M input tokens. OpenAI o4-mini is $13.90/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 OpenAI o4-mini on Rival?

This page shows a side-by-side comparison of Claude Opus 4 and OpenAI o4-mini 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 OpenAI o4-mini: Which Is Better?

Updated May 2025

Our Verdict

Claude Opus 4

OpenAI o4-miniRunner-up

No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, newer, bigger context window.

OpenAI o4-mini is 17x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

OpenAI o4-mini

Input

$1.10

14× cheaper

Output

$4.40

17× cheaper

OpenAI o4-mini is cheaper on both — 14× input, 17× output

Writing DNA

Style Comparison

Similarity

41%

Claude Opus 4 uses 444.0x more bold

Claude Opus 4

OpenAI o4-mini

64%Vocabulary73%

62wSentence Length15w

0.52Hedging0.18

4.4Bold0.0

9.1Lists2.1

0.11Emoji0.00

1.87Headings0.00

0.27Transitions0.02

Based on 16 + 10 text responses

Research

What we learned reading every model

Claude Opus 4 and OpenAI o4-mini 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 vs MiniMax M1New provider

OpenAI o4-mini vs Gemini 2.5 Pro Preview 06-05New provider

OpenAI o4-mini vs Claude Sonnet 4Cross-provider

Updated May 2025

Our Verdict

Claude Opus 4

OpenAI o4-miniRunner-up

No community votes yet. On paper, Claude Opus 4 has the edge — bigger model tier, newer, bigger context window.

OpenAI o4-mini is 17x cheaper per token — worth considering if cost matters.

Too close to call

API pricing

Cost per 1M tokens

Claude Opus 4

Input

$15.00

Output

$75.00

OpenAI o4-mini

Input

$1.10

14× cheaper

Output

$4.40

17× cheaper

OpenAI o4-mini is cheaper on both — 14× input, 17× output

Writing DNA

Style Comparison

Similarity

41%

Claude Opus 4 uses 444.0x more bold

Claude Opus 4

OpenAI o4-mini

64%Vocabulary73%

62wSentence Length15w

0.52Hedging0.18

4.4Bold0.0

9.1Lists2.1

0.11Emoji0.00

1.87Headings0.00

0.27Transitions0.02

Based on 16 + 10 text responses

Research

What we learned reading every model

Claude Opus 4 and OpenAI o4-mini 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 vs MiniMax M1New provider

OpenAI o4-mini vs Gemini 2.5 Pro Preview 06-05New provider

OpenAI o4-mini vs Claude Sonnet 4Cross-provider