Gemini 2.5 Pro (I/O Edition) vs OpenAI o4-mini
Compare Gemini 2.5 Pro (I/O Edition) by Google AI against OpenAI o4-mini by OpenAI, tested across 41 shared challenges. Updated May 2026.
Which is better, Gemini 2.5 Pro (I/O Edition) or OpenAI o4-mini?
Gemini 2.5 Pro (I/O Edition) and OpenAI o4-mini are both competitive models. Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens vs $1.1/M for OpenAI o4-mini. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Pro (I/O Edition) and OpenAI o4-mini
Gemini 2.5 Pro (I/O Edition) is made by google while OpenAI o4-mini is from openai. On pricing, Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens vs $1.1/M for OpenAI o4-mini.
API pricing
Per 1M tokens
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00
OpenAI o4-mini
Input
$1.10
1.1× cheaper
Output
$4.40
2.3× cheaper
OpenAI o4-mini is cheaper on both — 1.1× input, 2.3× output
Our Verdict
Gemini 2.5 Pro (I/O Edition)
OpenAI o4-miniRunner-up
No community votes yet. On paper, Gemini 2.5 Pro (I/O Edition) has the edge — bigger model tier.
Too close to call
Writing DNA
Style Comparison
Similarity
57%
Gemini 2.5 Pro (I/O Edition) uses 578.2x more bold
Gemini 2.5 Pro (I/O Edition)
OpenAI o4-mini
58%Vocabulary73%
16wSentence Length15w
0.38Hedging0.18
5.8Bold0.0
5.0Lists2.1
0.00Emoji0.00
0.63Headings0.00
0.01Transitions0.02
Based on 16 + 10 text responses
FAQ
