DeepSeek V4 Flash 0731 vs GPT-5.3 Chat
Compare DeepSeek V4 Flash 0731 by DeepSeek against GPT-5.3 Chat by OpenAI, context windows of 1.0M vs 128K, tested across 42 shared challenges.
Our Verdict
DeepSeek V4 Flash 0731
GPT-5.3 ChatRunner-up
No community votes yet. On paper, DeepSeek V4 Flash 0731 has the edge — newer, bigger context window.
DeepSeek V4 Flash 0731 is 50x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash 0731
Input
$0.14
12× cheaper
Output
$0.28
50× cheaper
GPT-5.3 Chat
Input
$1.75
Output
$14.00
DeepSeek V4 Flash 0731 is cheaper on both — 12× input, 50× output
Writing DNA
Style Comparison
Similarity
42%
DeepSeek V4 Flash 0731 uses 83.0x more headings
DeepSeek V4 Flash 0731
GPT-5.3 Chat
52%Vocabulary59%
18wSentence Length26w
0.38Hedging0.84
5.7Bold1.7
3.4Lists6.6
0.00Emoji0.00
0.83Headings0.00
0.04Transitions0.25
Based on 23 + 23 text responses
Research
What we learned reading every model
FAQ
