GPT-5 vs xAI: Grok 4.5
Compare GPT-5 by OpenAI against xAI: Grok 4.5 by xAI, context windows of 400K vs 500K, tested across 51 shared challenges.
Our Verdict
GPT-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.
Too close to call
API pricing
Cost per 1M tokens
GPT-5
Input
$1.25
1.6× cheaper
Output
$10.00
xAI: Grok 4.5
Input
$2.00
Output
$6.00
1.7× cheaper
GPT-5 wins input (1.6× cheaper)·xAI: Grok 4.5 wins output (1.7× cheaper)
Writing DNA
Style Comparison
Similarity
83%
xAI: Grok 4.5 uses 9.0x more emoji
GPT-5
xAI: Grok 4.5
65%Vocabulary61%
13wSentence Length16w
0.20Hedging0.23
0.2Bold2.5
4.6Lists2.4
0.00Emoji0.09
0.16Headings0.48
0.03Transitions0.06
Based on 16 + 27 text responses
Research
What we learned reading every model
FAQ
