GPT-5.4 Mini vs xAI: Grok 4.5
Compare GPT-5.4 Mini by OpenAI against xAI: Grok 4.5 by xAI, context windows of 400K vs 500K, tested across 53 shared challenges.
Our Verdict
xAI: Grok 4.5
GPT-5.4 MiniRunner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4 Mini
Input
$0.75
2.7× cheaper
Output
$4.50
1.3× cheaper
xAI: Grok 4.5
Input
$2.00
Output
$6.00
GPT-5.4 Mini is cheaper on both — 2.7× input, 1.3× output
Writing DNA
Style Comparison
Similarity
29%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-5.4 Mini
xAI: Grok 4.5
54%Vocabulary61%
20wSentence Length16w
0.72Hedging0.23
6.0Bold2.5
8.3Lists2.4
0.00Emoji0.09
2.11Headings0.48
0.04Transitions0.06
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
