Gemini 2.5 Flash Preview 05-20 (thinking) vs GPT-5
Compare Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI against GPT-5 by OpenAI, context windows of 1.0M vs 400K, tested across 12 shared challenges.
Our Verdict
GPT-5
Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up
No community votes yet. On paper, GPT-5 has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
8.3× cheaper
Output
$3.50
2.9× cheaper
GPT-5
Input
$1.25
Output
$10.00
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 8.3× input, 2.9× output
Writing DNA
Style Comparison
Similarity
55%
GPT-5 uses 19.5x more hedging
Gemini 2.5 Flash Preview 05-20 (thinking)
GPT-5
70%Vocabulary65%
11wSentence Length13w
0.00Hedging0.20
4.2Bold0.2
7.3Lists4.6
0.00Emoji0.00
0.00Headings0.16
0.00Transitions0.03
Based on 3 + 16 text responses
Research
What we learned reading every model
FAQ
