Google: Gemini 2.5 Flash Preview 09-2025 vs GPT-5.4 Nano
Compare Google: Gemini 2.5 Flash Preview 09-2025 by Google AI against GPT-5.4 Nano by OpenAI, context windows of 1.0M vs 400K, tested across 50 shared challenges.
Our Verdict
Google: Gemini 2.5 Flash Preview 09-2025
GPT-5.4 NanoRunner-up
No community votes yet. On paper, Google: Gemini 2.5 Flash Preview 09-2025 has the edge — bigger model tier, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
Output
$2.50
GPT-5.4 Nano
Input
$0.20
1.5× cheaper
Output
$1.25
2.0× cheaper
GPT-5.4 Nano is cheaper on both — 1.5× input, 2.0× output
Writing DNA
Style Comparison
Similarity
60%
Google: Gemini 2.5 Flash Preview 09-2025 uses 13.5x more emoji
Google: Gemini 2.5 Flash Preview 09-2025
GPT-5.4 Nano
53%Vocabulary51%
19wSentence Length21w
0.30Hedging0.58
5.8Bold7.1
3.1Lists5.5
0.14Emoji0.01
0.93Headings1.39
0.22Transitions0.05
Based on 22 + 23 text responses
Research
What we learned reading every model
FAQ
