Google: Gemini 2.5 Flash Preview 09-2025 vs OpenAI o3
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against OpenAI o3 by OpenAI, tested across 51 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
OpenAI o3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Google: Gemini 2.5 Flash Preview 09-2025 is 16x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
33× cheaper
Output
$2.50
16× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Google: Gemini 2.5 Flash Preview 09-2025 is cheaper on both — 33× input, 16× output
Writing DNA
Style Comparison
Similarity
44%
Google: Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Google: Gemini 2.5 Flash Preview 09-2025
OpenAI o3
53%Vocabulary68%
19wSentence Length14w
0.30Hedging0.26
5.8Bold0.7
3.1Lists3.0
0.14Emoji0.00
0.93Headings0.38
0.22Transitions0.12
Based on 22 + 16 text responses
Research
What we learned reading every model
FAQ
