Gemini 3.5 Flash vs GPT-5.5
Compare Gemini 3.5 Flash by Google AI against GPT-5.5 by OpenAI, context windows of 1.0M vs 1.1M, tested across 54 shared challenges.
Our Verdict
GPT-5.5
Gemini 3.5 FlashRunner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier.
Gemini 3.5 Flash is 3.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Gemini 3.5 Flash
Input
$1.50
3.3× cheaper
Output
$9.00
3.3× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
Gemini 3.5 Flash is cheaper on both — 3.3× input, 3.3× output
Writing DNA
Style Comparison
Similarity
68%
GPT-5.5 uses 4.7x more hedging
Gemini 3.5 Flash
GPT-5.5
59%Vocabulary58%
18wSentence Length18w
0.16Hedging0.74
4.4Bold2.9
3.0Lists5.1
0.00Emoji0.00
0.89Headings1.68
0.11Transitions0.03
Based on 27 + 26 text responses
Research
What we learned reading every model
FAQ
Common questions
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