Claude 3 Opus vs Gemini 3 Pro Preview

Compare Claude 3 Opus by Anthropic against Gemini 3 Pro Preview by Google AI, tested across 12 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or Gemini 3 Pro Preview?

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

Key Differences Between Claude 3 Opus and Gemini 3 Pro Preview

Claude 3 Opus is made by anthropic while Gemini 3 Pro Preview is from google.

Our Verdict
Claude 3 Opus
Claude 3 Opus
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
95%

Gemini 3 Pro Preview uses 768.4x more bold

Claude 3 Opus
Gemini 3 Pro Preview
54%Vocabulary58%
14wSentence Length17w
0.48Hedging0.37
0.0Bold7.7
3.0Lists4.8
0.00Emoji0.00
0.00Headings0.90
0.06Transitions0.25
Based on 3 + 23 text responses
vs

Ask them anything yourself

Claude 3 OpusGemini 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

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