Gemini 2.5 Flash Preview 09-2025 vs Gemini Pro 1.0
Compare Gemini 2.5 Flash Preview 09-2025 and Gemini Pro 1.0, both from Google AI, context windows of 1.0M vs 33K, tested across 27 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview 09-2025
Gemini Pro 1.0Runner-up
No community votes yet. On paper, Gemini 2.5 Flash Preview 09-2025 has the edge — bigger model tier, newer, bigger context window.
Slight edge
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 09-2025
Input
$0.30
1.7× cheaper
Output
$2.50
Gemini Pro 1.0
Input
$0.50
Output
$1.50
1.7× cheaper
Gemini 2.5 Flash Preview 09-2025 wins input (1.7× cheaper)·Gemini Pro 1.0 wins output (1.7× cheaper)
Writing DNA
Style Comparison
Similarity
44%
Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Gemini 2.5 Flash Preview 09-2025
Gemini Pro 1.0
53%Vocabulary61%
19wSentence Length13w
0.30Hedging0.41
5.8Bold5.3
3.1Lists5.4
0.14Emoji0.00
0.93Headings0.46
0.22Transitions0.38
Based on 22 + 13 text responses
Research
What we learned reading every model
FAQ
