Gemini 2.5 Pro (I/O Edition) vs o3 Mini
Compare Gemini 2.5 Pro (I/O Edition) by Google AI against o3 Mini by OpenAI, tested across 41 shared challenges. Updated June 2026.
Which is better, Gemini 2.5 Pro (I/O Edition) or o3 Mini?
Gemini 2.5 Pro (I/O Edition) and o3 Mini are both competitive models. Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens vs $1.1/M for o3 Mini. Compare their real outputs side by side below.
Key Differences Between Gemini 2.5 Pro (I/O Edition) and o3 Mini
Gemini 2.5 Pro (I/O Edition) is made by google while o3 Mini is from openai. On pricing, Gemini 2.5 Pro (I/O Edition) costs $1.25/M input tokens vs $1.1/M for o3 Mini.
API pricing
Per 1M tokens
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
Output
$10.00
o3 Mini
Input
$1.10
1.1× cheaper
Output
$4.40
2.3× cheaper
o3 Mini is cheaper on both — 1.1× input, 2.3× output
Our Verdict
Gemini 2.5 Pro (I/O Edition)
o3 MiniRunner-up
No community votes yet. On paper, Gemini 2.5 Pro (I/O Edition) has the edge — bigger model tier, newer.
Too close to call
Writing DNA
Style Comparison
Similarity
39%
o3 Mini uses 31.8x more transitions
Gemini 2.5 Pro (I/O Edition)
o3 Mini
58%Vocabulary65%
16wSentence Length17w
0.38Hedging0.74
5.8Bold3.9
5.0Lists1.7
0.00Emoji0.00
0.63Headings0.47
0.01Transitions0.38
Based on 16 + 12 text responses
FAQ
