DeepSeek V4 Pro vs GPT-5.3-Codex
Compare DeepSeek V4 Pro by DeepSeek against GPT-5.3-Codex by OpenAI, context windows of 1.0M vs 400K, tested across 53 shared challenges.
Our Verdict
DeepSeek V4 Pro
GPT-5.3-CodexRunner-up
No community votes yet. On paper, DeepSeek V4 Pro has the edge — newer, bigger context window.
DeepSeek V4 Pro is 4.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Pro
Input
$1.74
Output
$3.48
4.0× cheaper
GPT-5.3-Codex
Input
$1.75
Output
$14.00
DeepSeek V4 Pro is cheaper on both 4.0× output
Writing DNA
Style Comparison
Similarity
30%
DeepSeek V4 Pro uses 5.4x more transitions
DeepSeek V4 Pro
GPT-5.3-Codex
57%Vocabulary65%
18wSentence Length23w
0.52Hedging0.51
3.3Bold6.5
2.3Lists6.2
0.04Emoji0.16
0.45Headings1.90
0.15Transitions0.03
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
