GPT-4.5
Nothing here. The model returned empty. We stared at it for a while.
GPT-4.5 vs GPT-5 Codex
Compare GPT-4.5 and GPT-5 Codex, both from OpenAI, tested across 24 shared challenges. Updated April 2026.
Which is better, GPT-4.5 or GPT-5 Codex?
GPT-4.5 and GPT-5 Codex are both competitive models. Compare their real outputs side by side below.
Key Differences Between GPT-4.5 and GPT-5 Codex
GPT-4.5 is made by openai while GPT-5 Codex is from openai.
Our Verdict
GPT-4.5
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
98%
GPT-5 Codex uses 14.6x more emoji
GPT-4.5
GPT-5 Codex
63%Vocabulary64%
16wSentence Length17w
0.57Hedging0.38
4.7Bold2.3
6.4Lists3.5
0.00Emoji0.15
1.30Headings0.49
0.54Transitions0.05
Based on 11 + 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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