GPT-4 vs GPT-5 Codex

Compare GPT-4 and GPT-5 Codex, both from OpenAI, tested across 20 shared challenges. Updated April 2026.

Which is better, GPT-4 or GPT-5 Codex?

GPT-4 and GPT-5 Codex are both competitive models. Compare their real outputs side by side below.

Key Differences Between GPT-4 and GPT-5 Codex

GPT-4 is made by openai while GPT-5 Codex is from openai.

Our Verdict
GPT-4
GPT-4
GPT-5 Codex
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
GPT-5 Codex
59%Vocabulary64%
18wSentence Length17w
1.10Hedging0.38
0.8Bold2.3
2.5Lists3.5
0.00Emoji0.15
0.00Headings0.49
0.45Transitions0.05
Based on 15 + 13 text responses
vs

Ask them anything yourself

GPT-4GPT-5 Codex

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
Free preview13 of 58 slides
FAQ

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