GPT-5.4 Pro vs xAI: Grok 4.5
Compare GPT-5.4 Pro by OpenAI against xAI: Grok 4.5 by xAI, context windows of 1.1M vs 500K, tested across 18 shared challenges.
Our Verdict
GPT-5.4 Pro
xAI: Grok 4.5Runner-up
No community votes yet. On paper, GPT-5.4 Pro has the edge — bigger model tier, bigger context window.
xAI: Grok 4.5 is 30x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4 Pro
Input
$30.00
Output
$180.00
xAI: Grok 4.5
Input
$2.00
15× cheaper
Output
$6.00
30× cheaper
xAI: Grok 4.5 is cheaper on both — 15× input, 30× output
Writing DNA
Style Comparison
Similarity
38%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-5.4 Pro
xAI: Grok 4.5
50%Vocabulary61%
35wSentence Length16w
0.70Hedging0.23
7.5Bold2.5
8.3Lists2.4
0.00Emoji0.09
2.52Headings0.48
0.01Transitions0.06
Based on 12 + 27 text responses
Research
What we learned reading every model
FAQ
