Claude Opus 4.5
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Claude Opus 4.5 vs GPT-5.1-Codex
Compare Claude Opus 4.5 by Anthropic against GPT-5.1-Codex by OpenAI, in 36 community votes, claude opus 4.5 wins 77% of head-to-head duels, tested across 53 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.5 or GPT-5.1-Codex?
Claude Opus 4.5 is the better choice overall, winning 77% of 36 blind community votes on Rival. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and GPT-5.1-Codex
Claude Opus 4.5 is made by anthropic while GPT-5.1-Codex is from openai. In community voting, In 36 community votes, Claude Opus 4.5 wins 77% of head-to-head duels.
In 36 community votes, Claude Opus 4.5 wins 77% of head-to-head duels. Claude Opus 4.5 leads in Web Design, Image Generation. Based on blind community voting from the Rival open dataset of 36+ human preference judgments for this pair.
Web Design: Claude Opus 4.5 wins 61% of votes
Image Generation: Claude Opus 4.5 wins 100% of votes
Our Verdict
Claude Opus 4.5Winner
GPT-5.1-CodexRunner-up
Pick Claude Opus 4.5. In 36 blind votes, Claude Opus 4.5 wins 77% of the time. That's not luck.
Claude Opus 4.5 particularly excels in Image Generation, Web Design.
Clear winner
Writing DNA
Style Comparison
Similarity
94%
Claude Opus 4.5 uses 15.2x more emoji
Claude Opus 4.5
GPT-5.1-Codex
64%Vocabulary70%
55wSentence Length17w
0.86Hedging0.39
5.8Bold3.4
4.5Lists3.5
0.15Emoji0.00
1.59Headings0.50
0.05Transitions0.38
Based on 24 + 14 text responses
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