xAI: Grok 4.5 vs OpenAI o3
Compare xAI: Grok 4.5 by xAI against OpenAI o3 by OpenAI, tested across 53 shared challenges.
Our Verdict
xAI: Grok 4.5
OpenAI o3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.5 is 6.7x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
xAI: Grok 4.5
Input
$2.00
5.0× cheaper
Output
$6.00
6.7× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
xAI: Grok 4.5 is cheaper on both — 5.0× input, 6.7× output
Writing DNA
Style Comparison
Similarity
80%
xAI: Grok 4.5 uses 9.0x more emoji
xAI: Grok 4.5
OpenAI o3
61%Vocabulary68%
16wSentence Length14w
0.23Hedging0.26
2.5Bold0.7
2.4Lists3.0
0.09Emoji0.00
0.48Headings0.38
0.06Transitions0.12
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
