OpenAI: GPT-5.6 Luna vs Grok 3 Thinking
Compare OpenAI: GPT-5.6 Luna 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
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
Input
$1.00
Output
$6.00
Grok 3 Thinking
Input
—
Output
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Writing DNA
Style Comparison
Similarity
68%
Grok 3 Thinking uses 2.5x more transitions
OpenAI: GPT-5.6 Luna
Grok 3 Thinking
59%Vocabulary46%
19wSentence Length19w
0.84Hedging1.11
2.7Bold3.3
4.5Lists2.6
0.00Emoji0.00
1.20Headings0.64
0.10Transitions0.25
Based on 27 + 6 text responses
Research
What we learned reading every model
FAQ
