Gemini 3 Pro Preview vs o1

Compare Gemini 3 Pro Preview by Google AI against o1 by OpenAI, tested across 51 shared challenges. Updated April 2026.

Which is better, Gemini 3 Pro Preview or o1?

Gemini 3 Pro Preview and o1 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Gemini 3 Pro Preview and o1

Gemini 3 Pro Preview is made by google while o1 is from openai.

Our Verdict
Gemini 3 Pro Preview
Gemini 3 Pro Preview
o1
o1Runner-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
99%

o1 uses 2.1x more hedging

Gemini 3 Pro Preview
o1
58%Vocabulary64%
17wSentence Length16w
0.37Hedging0.76
7.7Bold5.0
4.8Lists2.6
0.00Emoji0.00
0.90Headings0.44
0.25Transitions0.40
Based on 23 + 13 text responses
vs

Ask them anything yourself

Gemini 3 Pro Previewo1

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
FAQ

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