Gemini 2.5 Flash Preview vs GPT-4.5
Compare Gemini 2.5 Flash Preview by Google AI against GPT-4.5 by OpenAI, context windows of 1.0M vs 128K, tested across 18 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview
GPT-4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 2.5 Flash Preview is 250x 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
500× cheaper
Output
$0.60
250× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
Gemini 2.5 Flash Preview is cheaper on both — 500× input, 250× output
Writing DNA
Style Comparison
Similarity
45%
GPT-4.5 uses 14.7x more headings
Gemini 2.5 Flash Preview
GPT-4.5
51%Vocabulary63%
15wSentence Length16w
0.70Hedging0.57
4.1Bold4.7
3.3Lists6.4
0.00Emoji0.00
0.09Headings1.30
0.24Transitions0.54
Based on 12 + 11 text responses
Research
What we learned reading every model
FAQ
