GPT-5.3 Chat vs xAI: Grok 4.3
Compare GPT-5.3 Chat by OpenAI against xAI: Grok 4.3 by xAI, context windows of 128K vs 1.0M, tested across 53 shared challenges.
Our Verdict
xAI: Grok 4.3
GPT-5.3 ChatRunner-up
No community votes yet. On paper, xAI: Grok 4.3 has the edge — newer, bigger context window.
xAI: Grok 4.3 is 5.6x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.3 Chat
Input
$1.75
Output
$14.00
xAI: Grok 4.3
Input
$1.25
1.4× cheaper
Output
$2.50
5.6× cheaper
xAI: Grok 4.3 is cheaper on both — 1.4× input, 5.6× output
Writing DNA
Style Comparison
Similarity
57%
xAI: Grok 4.3 uses 34.1x more headings
GPT-5.3 Chat
xAI: Grok 4.3
59%Vocabulary62%
26wSentence Length16w
0.84Hedging0.46
1.7Bold2.3
6.6Lists2.5
0.00Emoji0.00
0.00Headings0.34
0.25Transitions0.14
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
