OpenAI: GPT-5.6 Luna Pro vs Grok 3 Thinking
Compare OpenAI: GPT-5.6 Luna Pro by OpenAI against Grok 3 Thinking by xAI, context windows of 1.1M vs 128K, tested across 13 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna Pro
Grok 3 Thinking
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
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
Output
$6.00
Grok 3 Thinking
Input
—
Output
—
Writing DNA
Style Comparison
Similarity
64%
OpenAI: GPT-5.6 Luna Pro uses 53.7x more emoji
OpenAI: GPT-5.6 Luna Pro
Grok 3 Thinking
58%Vocabulary46%
18wSentence Length19w
0.81Hedging1.11
2.9Bold3.3
5.1Lists2.6
0.54Emoji0.00
1.10Headings0.64
0.09Transitions0.25
Based on 27 + 6 text responses
Research
What we learned reading every model
FAQ
