ChatGPT-4o (March 2025) vs Gemini 3 Pro Preview

Compare ChatGPT-4o (March 2025) by OpenAI against Gemini 3 Pro Preview by Google AI, tested across 32 shared challenges. Updated April 2026.

Which is better, ChatGPT-4o (March 2025) or Gemini 3 Pro Preview?

ChatGPT-4o (March 2025) and Gemini 3 Pro Preview are both competitive models. Compare their real outputs side by side below.

Key Differences Between ChatGPT-4o (March 2025) and Gemini 3 Pro Preview

ChatGPT-4o (March 2025) is made by openai while Gemini 3 Pro Preview is from google.

Our Verdict
ChatGPT-4o (March 2025)
ChatGPT-4o (March 2025)
Gemini 3 Pro Preview
Gemini 3 Pro Preview

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
96%

ChatGPT-4o (March 2025) uses 94.5x more emoji

ChatGPT-4o (March 2025)
Gemini 3 Pro Preview
55%Vocabulary58%
24wSentence Length17w
0.52Hedging0.37
3.3Bold7.7
6.0Lists4.8
0.94Emoji0.00
0.63Headings0.90
0.05Transitions0.25
Based on 15 + 23 text responses
vs

Ask them anything yourself

ChatGPT-4o (March 2025)Gemini 3 Pro Preview

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

Common questions