GPT-5.4 vs xAI: Grok 4.5
Compare GPT-5.4 by OpenAI against xAI: Grok 4.5 by xAI, context windows of 1.1M vs 500K, tested across 53 shared challenges.
Our Verdict
GPT-5.4
xAI: Grok 4.5Runner-up
No community votes yet. On paper, GPT-5.4 has the edge — bigger model tier, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4
Input
$2.50
Output
$15.00
xAI: Grok 4.5
Input
$2.00
1.3× cheaper
Output
$6.00
2.5× cheaper
xAI: Grok 4.5 is cheaper on both — 1.3× input, 2.5× output
Writing DNA
Style Comparison
Similarity
34%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-5.4
xAI: Grok 4.5
54%Vocabulary61%
28wSentence Length16w
0.69Hedging0.23
4.1Bold2.5
8.1Lists2.4
0.00Emoji0.09
1.84Headings0.48
0.02Transitions0.06
Based on 22 + 27 text responses
Research
What we learned reading every model
FAQ
