Gemini 3.5 Flash vs OpenAI o3
Compare Gemini 3.5 Flash by Google AI against OpenAI o3 by OpenAI, tested across 53 shared challenges.
Our Verdict
Gemini 3.5 Flash
OpenAI o3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 3.5 Flash is 4.4x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 3.5 Flash
Input
$1.50
6.7× cheaper
Output
$9.00
4.4× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Gemini 3.5 Flash is cheaper on both — 6.7× input, 4.4× output
Writing DNA
Style Comparison
Similarity
47%
Gemini 3.5 Flash uses 6.4x more bold
Gemini 3.5 Flash
OpenAI o3
59%Vocabulary68%
18wSentence Length14w
0.16Hedging0.26
4.4Bold0.7
3.0Lists3.0
0.00Emoji0.00
0.89Headings0.38
0.11Transitions0.12
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
Common questions
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