Claude Opus 5 vs OpenAI o4 Mini High
Compare Claude Opus 5 by Anthropic against OpenAI o4 Mini High by OpenAI, context windows of 1.0M vs 200K, tested across 53 shared challenges.
Our Verdict
Claude Opus 5
OpenAI o4 Mini HighRunner-up
No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window.
OpenAI o4 Mini High is 5.7x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
Output
$25.00
OpenAI o4 Mini High
Input
$1.10
4.5× cheaper
Output
$4.40
5.7× cheaper
OpenAI o4 Mini High is cheaper on both — 4.5× input, 5.7× output
Writing DNA
Style Comparison
Similarity
55%
Claude Opus 5 uses 394.1x more bold
Claude Opus 5
OpenAI o4 Mini High
54%Vocabulary70%
21wSentence Length18w
0.40Hedging0.33
3.9Bold0.0
1.9Lists1.3
0.02Emoji0.02
0.71Headings0.00
0.05Transitions0.04
Based on 27 + 14 text responses
Research
What we learned reading every model
FAQ
