GPT-5.3 Chat vs xAI: Grok 4
Compare GPT-5.3 Chat by OpenAI against xAI: Grok 4 by xAI, context windows of 128K vs 256K, tested across 53 shared challenges.
Our Verdict
GPT-5.3 Chat
xAI: Grok 4
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
API pricing
Cost per 1M tokens
GPT-5.3 Chat
Input
$1.75
1.7× cheaper
Output
$14.00
1.1× cheaper
xAI: Grok 4
Input
$3.00
Output
$15.00
GPT-5.3 Chat is cheaper on both — 1.7× input, 1.1× output
Writing DNA
Style Comparison
Similarity
38%
xAI: Grok 4 uses 7.0x more emoji
GPT-5.3 Chat
xAI: Grok 4
59%Vocabulary53%
26wSentence Length18w
0.84Hedging0.67
1.7Bold2.7
6.6Lists2.7
0.00Emoji0.07
0.00Headings0.86
0.25Transitions0.04
Based on 23 + 21 text responses
Research
What we learned reading every model
FAQ
