ChatGPT-4o (March 2025) vs Gemini 2.5 Pro (I/O Edition)
Compare ChatGPT-4o (March 2025) by OpenAI against Gemini 2.5 Pro (I/O Edition) by Google AI, tested across 30 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
Gemini 2.5 Pro (I/O Edition)
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
4.0× cheaper
Output
$10.00
1.5× cheaper
Gemini 2.5 Pro (I/O Edition) is cheaper on both — 4.0× input, 1.5× output
Writing DNA
Style Comparison
Similarity
47%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
Gemini 2.5 Pro (I/O Edition)
55%Vocabulary58%
24wSentence Length16w
0.52Hedging0.38
3.3Bold5.8
6.0Lists5.0
0.94Emoji0.00
0.63Headings0.63
0.05Transitions0.01
Based on 15 + 16 text responses
Research
What we learned reading every model
FAQ
