Gemini 2.5 Flash Preview vs OpenAI o4-mini
Compare Gemini 2.5 Flash Preview by Google AI against OpenAI o4-mini by OpenAI, tested across 27 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview
OpenAI o4-mini
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 2.5 Flash Preview is 7.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview
Input
$0.15
7.3× cheaper
Output
$0.60
7.3× cheaper
OpenAI o4-mini
Input
$1.10
Output
$4.40
Gemini 2.5 Flash Preview is cheaper on both — 7.3× input, 7.3× output
Writing DNA
Style Comparison
Similarity
47%
Gemini 2.5 Flash Preview uses 407.5x more bold
Gemini 2.5 Flash Preview
OpenAI o4-mini
51%Vocabulary73%
15wSentence Length15w
0.70Hedging0.18
4.1Bold0.0
3.3Lists2.1
0.00Emoji0.00
0.09Headings0.00
0.24Transitions0.02
Based on 12 + 10 text responses
Research
What we learned reading every model
FAQ
