Gemini 2.5 Flash Preview 05-20 (thinking) vs OpenAI o4-mini
Compare Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI against OpenAI o4-mini by OpenAI, tested across 12 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview 05-20 (thinking)
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.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
7.3× cheaper
Output
$3.50
1.3× cheaper
OpenAI o4-mini
Input
$1.10
Output
$4.40
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 7.3× input, 1.3× output
Writing DNA
Style Comparison
Similarity
79%
OpenAI o4-mini uses 18.3x more hedging
Gemini 2.5 Flash Preview 05-20 (thinking)
OpenAI o4-mini
70%Vocabulary73%
11wSentence Length15w
0.00Hedging0.18
4.2Bold0.0
7.3Lists2.1
0.00Emoji0.00
0.00Headings0.00
0.00Transitions0.02
Based on 3 + 10 text responses
Research
What we learned reading every model
FAQ
