Gemini 2.5 Flash Preview vs OpenAI o3
Compare Gemini 2.5 Flash Preview by Google AI against OpenAI o3 by OpenAI, tested across 27 shared challenges.
Our Verdict
OpenAI o3
Gemini 2.5 Flash PreviewRunner-up
No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier.
Gemini 2.5 Flash Preview is 67x 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
67× cheaper
Output
$0.60
67× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Gemini 2.5 Flash Preview is cheaper on both — 67× input, 67× output
Writing DNA
Style Comparison
Similarity
30%
Gemini 2.5 Flash Preview uses 5.9x more bold
Gemini 2.5 Flash Preview
OpenAI o3
51%Vocabulary68%
15wSentence Length14w
0.70Hedging0.26
4.1Bold0.7
3.3Lists3.0
0.00Emoji0.00
0.09Headings0.38
0.24Transitions0.12
Based on 12 + 16 text responses
Research
What we learned reading every model
FAQ
