GPT-5.6 Luna vs Grok 3 Beta
Compare GPT-5.6 Luna by OpenAI against Grok 3 Beta by xAI, context windows of 1.1M vs 131K, tested across 53 shared challenges.
Our Verdict
GPT-5.6 Luna
Grok 3 Beta
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-5.6 Luna
Input
$1.00
2.0× cheaper
Output
$6.00
Grok 3 Beta
Input
$2.00
Output
$4.00
1.5× cheaper
GPT-5.6 Luna wins input (2.0× cheaper)·Grok 3 Beta wins output (1.5× cheaper)
Writing DNA
Style Comparison
Similarity
58%
Grok 3 Beta uses 2.8x more transitions
GPT-5.6 Luna
Grok 3 Beta
59%Vocabulary48%
19wSentence Length19w
0.84Hedging0.67
2.7Bold3.1
4.5Lists5.5
0.00Emoji0.00
1.20Headings0.52
0.10Transitions0.28
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
