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Gemini 3 Pro Preview vs OpenAI o3

Compare Gemini 3 Pro Preview by Google AI against OpenAI o3 by OpenAI, tested across 51 shared challenges. Updated April 2026.

Which is better, Gemini 3 Pro Preview or OpenAI o3?

Gemini 3 Pro Preview and OpenAI o3 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Gemini 3 Pro Preview and OpenAI o3

Gemini 3 Pro Preview is made by google while OpenAI o3 is from openai.

Our Verdict
Gemini 3 Pro Preview
Gemini 3 Pro Preview
OpenAI o3
OpenAI o3

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
Writing DNA

Style Comparison

Similarity
99%

Gemini 3 Pro Preview uses 11.0x more bold

Gemini 3 Pro Preview
OpenAI o3
58%Vocabulary68%
17wSentence Length14w
0.37Hedging0.26
7.7Bold0.7
4.8Lists3.0
0.00Emoji0.00
0.90Headings0.38
0.25Transitions0.12
Based on 23 + 16 text responses
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Ask them anything yourself

Gemini 3 Pro PreviewOpenAI o3

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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