Claude Sonnet 4.5
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Claude Sonnet 4.5 vs GPT-5 Codex
Compare Claude Sonnet 4.5 by Anthropic against GPT-5 Codex by OpenAI, in 245 community votes, claude sonnet 4.5 wins 70% of head-to-head duels, tested across 42 shared challenges. Updated April 2026.
Which is better, Claude Sonnet 4.5 or GPT-5 Codex?
Claude Sonnet 4.5 is the better choice overall, winning 70% of 245 blind community votes on Rival. Compare their real outputs side by side below.
Key Differences Between Claude Sonnet 4.5 and GPT-5 Codex
Claude Sonnet 4.5 is made by anthropic while GPT-5 Codex is from openai. In community voting, In 245 community votes, Claude Sonnet 4.5 wins 70% of head-to-head duels.
In 245 community votes, Claude Sonnet 4.5 wins 70% of head-to-head duels. Claude Sonnet 4.5 leads in Web Design, Reasoning, Image Generation. Based on blind community voting from the Rival open dataset of 245+ human preference judgments for this pair.
Web Design: Claude Sonnet 4.5 wins 75% of votes
Reasoning: Claude Sonnet 4.5 wins 59% of votes
Image Generation: Claude Sonnet 4.5 wins 62% of votes
Conversation: Claude Sonnet 4.5 wins 100% of votes
Analysis: Claude Sonnet 4.5 wins 69% of votes
Our Verdict
Claude Sonnet 4.5Winner
GPT-5 CodexRunner-up
Pick Claude Sonnet 4.5. In 245 blind votes, Claude Sonnet 4.5 wins 70% of the time. That's not luck.
Claude Sonnet 4.5 particularly excels in Conversation, Web Design, Analysis.
Clear winner
Writing DNA
Style Comparison
Similarity
93%
Claude Sonnet 4.5 uses 5.4x more sentence length
Claude Sonnet 4.5
GPT-5 Codex
64%Vocabulary64%
94wSentence Length17w
0.48Hedging0.38
4.9Bold2.3
8.0Lists3.5
0.45Emoji0.15
1.91Headings0.49
0.07Transitions0.05
Based on 20 + 13 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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