ChatGPT-4o (March 2025) vs xAI: Grok 4.3
Compare ChatGPT-4o (March 2025) by OpenAI against xAI: Grok 4.3 by xAI, context windows of 128K vs 1.0M, tested across 32 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
xAI: Grok 4.3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.3 is 6.0x 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
xAI: Grok 4.3
Input
$1.25
4.0× cheaper
Output
$2.50
6.0× cheaper
xAI: Grok 4.3 is cheaper on both — 4.0× input, 6.0× output
Writing DNA
Style Comparison
Similarity
29%
ChatGPT-4o (March 2025) uses 94.5x more emoji
ChatGPT-4o (March 2025)
xAI: Grok 4.3
55%Vocabulary62%
24wSentence Length16w
0.52Hedging0.46
3.3Bold2.3
6.0Lists2.5
0.94Emoji0.00
0.63Headings0.34
0.05Transitions0.14
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
