GPT-4o mini vs Grok 4.5
Compare GPT-4o mini by OpenAI against Grok 4.5 by xAI, context windows of 128K vs 500K, tested across 53 shared challenges.
Our Verdict
Grok 4.5
GPT-4o miniRunner-up
No community votes yet. On paper, Grok 4.5 has the edge — bigger model tier, newer, bigger context window.
GPT-4o mini is 10x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-4o mini
Input
$0.15
13× cheaper
Output
$0.60
10× cheaper
Grok 4.5
Input
$2.00
Output
$6.00
GPT-4o mini is cheaper on both — 13× input, 10× output
Writing DNA
Style Comparison
Similarity
41%
Grok 4.5 uses 9.0x more emoji
GPT-4o mini
Grok 4.5
54%Vocabulary61%
18wSentence Length16w
0.84Hedging0.23
3.8Bold2.5
3.3Lists2.4
0.00Emoji0.09
1.03Headings0.48
0.23Transitions0.06
Based on 22 + 27 text responses
Research
What we learned reading every model
FAQ
