Gemini 2.5 Flash Preview 09-2025 vs OpenAI o4-mini
Compare Gemini 2.5 Flash Preview 09-2025 by Google AI against OpenAI o4-mini by OpenAI, tested across 51 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview 09-2025
OpenAI o4-miniRunner-up
No community votes yet. On paper, Gemini 2.5 Flash Preview 09-2025 has the edge — bigger model tier, newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 09-2025
Input
$0.30
3.7× cheaper
Output
$2.50
1.8× cheaper
OpenAI o4-mini
Input
$1.10
Output
$4.40
Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 3.7× input, 1.8× output
Writing DNA
Style Comparison
Similarity
33%
Gemini 2.5 Flash Preview 09-2025 uses 584.8x more bold
Gemini 2.5 Flash Preview 09-2025
OpenAI o4-mini
53%Vocabulary73%
19wSentence Length15w
0.30Hedging0.18
5.8Bold0.0
3.1Lists2.1
0.14Emoji0.00
0.93Headings0.00
0.22Transitions0.02
Based on 22 + 10 text responses
Research
What we learned reading every model
FAQ
