Claude Opus 4.5 vs Gemini 2.5 Pro Experimental

Compare Claude Opus 4.5 by Anthropic against Gemini 2.5 Pro Experimental by Google AI, tested across 43 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.5 or Gemini 2.5 Pro Experimental?

Claude Opus 4.5 and Gemini 2.5 Pro Experimental are both competitive models. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.5 and Gemini 2.5 Pro Experimental

Claude Opus 4.5 is made by anthropic while Gemini 2.5 Pro Experimental is from google.

Our Verdict
Claude Opus 4.5
Claude Opus 4.5
Gemini 2.5 Pro Experimental
Gemini 2.5 Pro Experimental

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
88%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5
Gemini 2.5 Pro Experimental
64%Vocabulary54%
55wSentence Length15w
0.86Hedging0.35
5.8Bold5.6
4.5Lists3.9
0.15Emoji0.00
1.59Headings0.39
0.05Transitions0.17
Based on 24 + 18 text responses
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Claude Opus 4.5Gemini 2.5 Pro Experimental

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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