GPT-4 vs GPT-5.3-Codex
Compare GPT-4 and GPT-5.3-Codex, both from OpenAI, context windows of 8K vs 400K, tested across 26 shared challenges.
Our Verdict
GPT-5.3-Codex
GPT-4Runner-up
No community votes yet. On paper, GPT-5.3-Codex has the edge — newer, bigger context window.
GPT-5.3-Codex is 4.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-4
Input
$30.00
Output
$60.00
GPT-5.3-Codex
Input
$1.75
17× cheaper
Output
$14.00
4.3× cheaper
GPT-5.3-Codex is cheaper on both — 17× input, 4.3× output
Writing DNA
Style Comparison
Similarity
34%
GPT-5.3-Codex uses 15.8x more emoji
GPT-4
GPT-5.3-Codex
59%Vocabulary65%
18wSentence Length23w
1.10Hedging0.51
0.8Bold6.5
2.5Lists6.2
0.00Emoji0.16
0.00Headings1.90
0.45Transitions0.03
Based on 15 + 23 text responses
Research
What we learned reading every model
FAQ
Common questions
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