Gemini 2.5 Flash Preview (thinking) vs GPT-5
Compare Gemini 2.5 Flash Preview (thinking) by Google AI against GPT-5 by OpenAI, in 3 community votes, gpt-5 wins 100% of head-to-head duels, context windows of 1.0M vs 400K, tested across 20 shared challenges.
Our Verdict
GPT-5Winner
Gemini 2.5 Flash Preview (thinking)Runner-up
Pick GPT-5. In 3 blind votes, GPT-5 wins 100% of the time. That's not luck.
Clear winner
API pricing
Cost per 1M tokens
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
7.1× cheaper
Output
$3.50
2.9× cheaper
GPT-5
Input
$1.25
Output
$10.00
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 7.1× input, 2.9× output
Writing DNA
Style Comparison
Similarity
37%
GPT-5 uses 16.2x more headings
Gemini 2.5 Flash Preview (thinking)
GPT-5
53%Vocabulary65%
14wSentence Length13w
0.38Hedging0.20
4.4Bold0.2
4.1Lists4.6
0.00Emoji0.00
0.00Headings0.16
0.24Transitions0.03
Based on 7 + 16 text responses
Research
What we learned reading every model
FAQ
