ChatGPT-4o (March 2025) vs DeepSeek V4 Pro
Compare ChatGPT-4o (March 2025) by OpenAI against DeepSeek V4 Pro by DeepSeek, context windows of 128K vs 1.0M, tested across 32 shared challenges.
Our Verdict
DeepSeek V4 Pro
ChatGPT-4o (March 2025)Runner-up
No community votes yet. On paper, DeepSeek V4 Pro has the edge — newer, bigger context window.
DeepSeek V4 Pro is 4.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
DeepSeek V4 Pro
Input
$1.74
2.9× cheaper
Output
$3.48
4.3× cheaper
DeepSeek V4 Pro is cheaper on both — 2.9× input, 4.3× output
Writing DNA
Style Comparison
Similarity
37%
ChatGPT-4o (March 2025) uses 27.0x more emoji
ChatGPT-4o (March 2025)
DeepSeek V4 Pro
55%Vocabulary57%
24wSentence Length18w
0.52Hedging0.52
3.3Bold3.3
6.0Lists2.3
0.94Emoji0.04
0.63Headings0.45
0.05Transitions0.15
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
