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Claude Opus 4.5 vs GPT-5

Compare Claude Opus 4.5 by Anthropic against GPT-5 by OpenAI, tested across 47 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.5 or GPT-5?

Claude Opus 4.5 and GPT-5 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.5 and GPT-5

Claude Opus 4.5 is made by anthropic while GPT-5 is from openai.

Our Verdict
Claude Opus 4.5
Claude Opus 4.5
GPT-5
GPT-5

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
92%

Claude Opus 4.5 uses 15.2x more emoji

Claude Opus 4.5
GPT-5
64%Vocabulary65%
55wSentence Length13w
0.86Hedging0.20
5.8Bold0.2
4.5Lists4.6
0.15Emoji0.00
1.59Headings0.16
0.05Transitions0.03
Based on 24 + 16 text responses
vs

Ask them anything yourself

Claude Opus 4.5GPT-5

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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