GPT-5 Codex
Nothing here. The model returned empty. We stared at it for a while.
GPT-5 Codex vs Claude Sonnet 4
Compare GPT-5 Codex by OpenAI against Claude Sonnet 4 by Anthropic, in 101 community votes, gpt-5 codex and claude sonnet 4 are closely matched, tested across 30 shared challenges. Updated April 2026.
Which is better, GPT-5 Codex or Claude Sonnet 4?
GPT-5 Codex and Claude Sonnet 4 are closely matched based on 101 community votes. Compare their real outputs side by side below.
Key Differences Between GPT-5 Codex and Claude Sonnet 4
GPT-5 Codex is made by openai while Claude Sonnet 4 is from anthropic. In community voting, In 101 community votes, GPT-5 Codex and Claude Sonnet 4 are closely matched.
In 101 community votes, GPT-5 Codex and Claude Sonnet 4 are closely matched. GPT-5 Codex leads in Web Design, Reasoning, while Claude Sonnet 4 leads in Image Generation. Based on blind community voting from the Rival open dataset of 101+ human preference judgments for this pair.
Web Design: GPT-5 Codex wins 56% of votes
Image Generation: Claude Sonnet 4 wins 56% of votes
Reasoning: GPT-5 Codex wins 60% of votes
Analysis: GPT-5 Codex and Claude Sonnet 4 are tied
Conversation: GPT-5 Codex and Claude Sonnet 4 are tied
Our Verdict
GPT-5 Codex
Claude Sonnet 4
Too close to call. Pick based on your use case.
Pick GPT-5 Codex for Reasoning, Web Design. Pick Claude Sonnet 4 for Image Generation.
Too close to call
Writing DNA
Style Comparison
Similarity
93%
Claude Sonnet 4 uses 6.4x more sentence length
GPT-5 Codex
Claude Sonnet 4
64%Vocabulary62%
17wSentence Length111w
0.38Hedging0.40
2.3Bold5.0
3.5Lists9.3
0.15Emoji0.88
0.49Headings2.16
0.05Transitions0.33
Based on 13 + 17 text responses
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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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