GPT-4 vs xAI: Grok 4.5
Compare GPT-4 by OpenAI against xAI: Grok 4.5 by xAI, context windows of 8K vs 500K, tested across 26 shared challenges.
Our Verdict
GPT-4
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 10x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-4
Input
$30.00
Output
$60.00
xAI: Grok 4.5
Input
$2.00
15× cheaper
Output
$6.00
10× cheaper
xAI: Grok 4.5 is cheaper on both — 15× input, 10× output
Writing DNA
Style Comparison
Similarity
42%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-4
xAI: Grok 4.5
59%Vocabulary61%
18wSentence Length16w
1.10Hedging0.23
0.8Bold2.5
2.5Lists2.4
0.00Emoji0.09
0.00Headings0.48
0.45Transitions0.06
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
Common questions
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