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Claude Opus 4.5 vs Gemini 3.1 Pro Preview

Compare Claude Opus 4.5 by Anthropic against Gemini 3.1 Pro Preview by Google AI, tested across 53 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.5 or Gemini 3.1 Pro Preview?

Claude Opus 4.5 and Gemini 3.1 Pro Preview are both competitive models. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.5 and Gemini 3.1 Pro Preview

Claude Opus 4.5 is made by anthropic while Gemini 3.1 Pro Preview is from google.

Our Verdict
Claude Opus 4.5
Claude Opus 4.5
Gemini 3.1 Pro Preview
Gemini 3.1 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
97%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5
Gemini 3.1 Pro Preview
64%Vocabulary54%
55wSentence Length18w
0.86Hedging0.29
5.8Bold4.9
4.5Lists3.3
0.15Emoji0.00
1.59Headings0.72
0.05Transitions0.14
Based on 24 + 23 text responses
vs

Ask them anything yourself

Claude Opus 4.5Gemini 3.1 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
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