Gemini 2.5 Flash Preview vs Gemini Pro 1.0
Compare Gemini 2.5 Flash Preview and Gemini Pro 1.0, both from Google AI, context windows of 1.0M vs 33K, tested across 24 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview
Gemini Pro 1.0
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
Input
$0.15
3.3× cheaper
Output
$0.60
2.5× cheaper
Gemini Pro 1.0
Input
$0.50
Output
$1.50
Gemini 2.5 Flash Preview is cheaper on both — 3.3× input, 2.5× output
Writing DNA
Style Comparison
Similarity
57%
Gemini Pro 1.0 uses 5.2x more headings
Gemini 2.5 Flash Preview
Gemini Pro 1.0
51%Vocabulary61%
15wSentence Length13w
0.70Hedging0.41
4.1Bold5.3
3.3Lists5.4
0.00Emoji0.00
0.09Headings0.46
0.24Transitions0.38
Based on 12 + 13 text responses
Research
What we learned reading every model
FAQ
