Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-5.4 Nano
Compare Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI against GPT-5.4 Nano by OpenAI, context windows of 1.0M vs 400K, tested across 11 shared challenges.
Our Verdict
Gemini 2.5 Flash Preview 05-20 (thinking)
GPT-5.4 NanoRunner-up
No community votes yet. On paper, Gemini 2.5 Flash Preview 05-20 (thinking) has the edge — bigger model tier, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
1.3× cheaper
Output
$3.50
GPT-5.4 Nano
Input
$0.20
Output
$1.25
2.8× cheaper
Gemini 2.5 Flash Preview 05-20 (thinking) wins input (1.3× cheaper)·GPT-5.4 Nano wins output (2.8× cheaper)
Writing DNA
Style Comparison
Similarity
26%
GPT-5.4 Nano uses 58.4x more hedging
Gemini 2.5 Flash Preview 05-20 (thinking)
GPT-5.4 Nano
70%Vocabulary51%
11wSentence Length21w
0.00Hedging0.58
4.2Bold7.1
7.3Lists5.5
0.00Emoji0.01
0.00Headings1.39
0.00Transitions0.05
Based on 3 + 23 text responses
Research
What we learned reading every model
FAQ
