OpenAI: GPT-5.6 Luna Pro vs Horizon Beta
Compare OpenAI: GPT-5.6 Luna Pro by OpenAI against Horizon Beta by OpenRouter, context windows of 1.1M vs 256K, tested across 40 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna Pro
Horizon 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
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
Output
$6.00
Horizon Beta
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
55%
OpenAI: GPT-5.6 Luna Pro uses 286.7x more bold
OpenAI: GPT-5.6 Luna Pro
Horizon Beta
58%Vocabulary62%
18wSentence Length15w
0.81Hedging0.24
2.9Bold0.0
5.1Lists2.2
0.54Emoji0.00
1.10Headings0.00
0.09Transitions0.18
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
