ChatGPT-4o (March 2025) vs Grok 4.5
Compare ChatGPT-4o (March 2025) by OpenAI against Grok 4.5 by xAI, context windows of 128K vs 500K, tested across 32 shared challenges.
Our Verdict
ChatGPT-4o (March 2025)
Grok 4.5
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
ChatGPT-4o (March 2025)
Input
$5.00
Output
$15.00
Grok 4.5
Input
$2.00
2.5× cheaper
Output
$6.00
2.5× cheaper
Grok 4.5 is cheaper on both — 2.5× input, 2.5× output
Writing DNA
Style Comparison
Similarity
30%
ChatGPT-4o (March 2025) uses 10.5x more emoji
ChatGPT-4o (March 2025)
Grok 4.5
55%Vocabulary61%
24wSentence Length16w
0.52Hedging0.23
3.3Bold2.5
6.0Lists2.4
0.94Emoji0.09
0.63Headings0.48
0.05Transitions0.06
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
