ChatGPT-4o (March 2025) vs Gemini 3 Flash Preview
Compare ChatGPT-4o (March 2025) by OpenAI against Gemini 3 Flash Preview by Google AI, context windows of 128K vs 1.0M, tested across 32 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
Gemini 3 Flash Preview
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Gemini 3 Flash Preview is 5.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Gemini 3 Flash Preview
Input
$0.50
10× cheaper
Output
$3.00
5.0× cheaper
Gemini 3 Flash Preview is cheaper on both — 10× input, 5.0× output
Writing DNA
Style Comparison
Similarity
49%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
Gemini 3 Flash Preview
55%Vocabulary55%
24wSentence Length18w
0.52Hedging0.42
3.3Bold7.1
6.0Lists4.5
0.94Emoji0.00
0.63Headings0.84
0.05Transitions0.07
Based on 15 + 24 text responses
Research
What we learned reading every model
FAQ
