OpenAI: GPT-5.6 Luna Pro vs Solar Pro 3
Compare OpenAI: GPT-5.6 Luna Pro by OpenAI against Solar Pro 3 by Upstage, context windows of 1.1M vs 128K, tested across 39 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna Pro
Solar Pro 3
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
Solar Pro 3
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
43%
OpenAI: GPT-5.6 Luna Pro uses 3.1x more emoji
OpenAI: GPT-5.6 Luna Pro
Solar Pro 3
58%Vocabulary50%
18wSentence Length21w
0.81Hedging0.42
2.9Bold6.5
5.1Lists2.2
0.54Emoji0.17
1.10Headings0.56
0.09Transitions0.12
Based on 27 + 18 text responses
Research
What we learned reading every model
FAQ
Common questions
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