Grok 4.5 vs OpenAI o3
Compare Grok 4.5 by xAI against OpenAI o3 by OpenAI, tested across 53 shared challenges.
Our Verdict
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.
Grok 4.5 is 6.7x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Grok 4.5
Input
$2.00
5.0× cheaper
Output
$6.00
6.7× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Grok 4.5 is cheaper on both — 5.0× input, 6.7× output
Writing DNA
Style Comparison
Similarity
80%
Grok 4.5 uses 9.0x more emoji
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
Common questions
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