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Gemini 3 Pro Preview vs OpenAI o4-mini

Compare Gemini 3 Pro Preview by Google AI against OpenAI o4-mini by OpenAI, tested across 35 shared challenges. Updated April 2026.

Which is better, Gemini 3 Pro Preview or OpenAI o4-mini?

Gemini 3 Pro Preview and OpenAI o4-mini are both competitive models. Compare their real outputs side by side below.

Key Differences Between Gemini 3 Pro Preview and OpenAI o4-mini

Gemini 3 Pro Preview is made by google while OpenAI o4-mini is from openai.

Our Verdict
Gemini 3 Pro Preview
Gemini 3 Pro Preview
OpenAI o4-mini
OpenAI o4-miniRunner-up

No community votes yet. On paper, Gemini 3 Pro Preview has the edge — bigger model tier, newer.

Too close to call
Writing DNA

Style Comparison

Similarity
95%

Gemini 3 Pro Preview uses 768.4x more bold

Gemini 3 Pro Preview
OpenAI o4-mini
58%Vocabulary73%
17wSentence Length15w
0.37Hedging0.18
7.7Bold0.0
4.8Lists2.1
0.00Emoji0.00
0.90Headings0.00
0.25Transitions0.02
Based on 23 + 10 text responses
vs

Ask them anything yourself

Gemini 3 Pro PreviewOpenAI o4-mini

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
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