GPT-4.5 vs xAI: Grok 4.5
Compare GPT-4.5 by OpenAI against xAI: Grok 4.5 by xAI, context windows of 128K vs 500K, tested across 24 shared challenges.
Our Verdict
GPT-4.5
xAI: Grok 4.5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.5 is 25x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.5
Input
$75.00
Output
$150.00
xAI: Grok 4.5
Input
$2.00
38× cheaper
Output
$6.00
25× cheaper
xAI: Grok 4.5 is cheaper on both — 38× input, 25× output
Writing DNA
Style Comparison
Similarity
48%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-4.5
xAI: Grok 4.5
63%Vocabulary61%
16wSentence Length16w
0.57Hedging0.23
4.7Bold2.5
6.4Lists2.4
0.00Emoji0.09
1.30Headings0.48
0.54Transitions0.06
Based on 11 + 27 text responses
Research
What we learned reading every model
FAQ
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