Claude Opus 4.5 vs GPT-5 Pro

Compare Claude Opus 4.5 by Anthropic against GPT-5 Pro by OpenAI, in 7 community votes, claude opus 4.5 wins 83% of head-to-head duels, tested across 42 shared challenges. Updated April 2026.

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

Claude Opus 4.5 is the better choice overall, winning 83% of 7 blind community votes on Rival. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.5 and GPT-5 Pro

Claude Opus 4.5 is made by anthropic while GPT-5 Pro is from openai. In community voting, In 7 community votes, Claude Opus 4.5 wins 83% of head-to-head duels.

In 7 community votes, Claude Opus 4.5 wins 83% of head-to-head duels. Claude Opus 4.5 leads in Web Design, Conversation. Based on blind community voting from the Rival open dataset of 7+ human preference judgments for this pair.

Web Design: Claude Opus 4.5 wins 67% of votes
Conversation: Claude Opus 4.5 wins 100% of votes
Our Verdict
Claude Opus 4.5
Claude Opus 4.5Winner
GPT-5 Pro
GPT-5 ProRunner-up

Pick Claude Opus 4.5. In 7 blind votes, Claude Opus 4.5 wins 83% of the time. That's not luck.

Claude Opus 4.5 particularly excels in Conversation, Web Design.

Clear winner
Writing DNA

Style Comparison

Similarity
91%

Claude Opus 4.5 uses 580.0x more bold

Claude Opus 4.5
GPT-5 Pro
64%Vocabulary65%
55wSentence Length15w
0.86Hedging0.32
5.8Bold0.0
4.5Lists2.9
0.15Emoji0.00
1.59Headings0.00
0.05Transitions0.01
Based on 24 + 11 text responses
vs

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Claude Opus 4.5GPT-5 Pro

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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