GPT-4o (Omni)
Nothing here. The model returned empty. We stared at it for a while.
GPT-4o (Omni) vs GPT-5 Codex
Compare GPT-4o (Omni) and GPT-5 Codex, both from OpenAI, tested across 49 shared challenges. Updated April 2026.
Which is better, GPT-4o (Omni) or GPT-5 Codex?
GPT-4o (Omni) and GPT-5 Codex are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-4o (Omni) and GPT-5 Codex
GPT-4o (Omni) is made by openai while GPT-5 Codex is from openai.
Our Verdict
GPT-4o (Omni)
GPT-5 Codex
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
94%
GPT-5 Codex uses 5.8x more emoji
GPT-4o (Omni)
GPT-5 Codex
54%Vocabulary64%
18wSentence Length17w
0.72Hedging0.38
7.3Bold2.3
5.6Lists3.5
0.03Emoji0.15
1.40Headings0.49
0.26Transitions0.05
Based on 24 + 13 text responses
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