xAI: Grok 4.5 vs OpenAI o4-mini
Compare xAI: Grok 4.5 by xAI against OpenAI o4-mini by OpenAI, tested across 53 shared challenges.
Our Verdict
xAI: Grok 4.5
OpenAI o4-miniRunner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — bigger model tier, newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
xAI: Grok 4.5
Input
$2.00
Output
$6.00
OpenAI o4-mini
Input
$1.10
1.8× cheaper
Output
$4.40
1.4× cheaper
OpenAI o4-mini is cheaper on both — 1.8× input, 1.4× output
Writing DNA
Style Comparison
Similarity
68%
xAI: Grok 4.5 uses 245.4x more bold
xAI: Grok 4.5
OpenAI o4-mini
61%Vocabulary73%
16wSentence Length15w
0.23Hedging0.18
2.5Bold0.0
2.4Lists2.1
0.09Emoji0.00
0.48Headings0.00
0.06Transitions0.02
Based on 27 + 10 text responses
Research
What we learned reading every model
FAQ
