GPT-5.4 Pro vs GPT-5.6 Luna Pro
Compare GPT-5.4 Pro and GPT-5.6 Luna Pro, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 18 shared challenges.
Our Verdict
GPT-5.4 Pro
GPT-5.6 Luna Pro
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.6 Luna Pro is 30x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-5.4 Pro
Input
$30.00
Output
$180.00
GPT-5.6 Luna Pro
Input
$1.00
30× cheaper
Output
$6.00
30× cheaper
GPT-5.6 Luna Pro is cheaper on both — 30× input, 30× output
Writing DNA
Style Comparison
Similarity
66%
GPT-5.6 Luna Pro uses 53.7x more emoji
GPT-5.4 Pro
GPT-5.6 Luna Pro
50%Vocabulary58%
35wSentence Length18w
0.70Hedging0.81
7.5Bold2.9
8.3Lists5.1
0.00Emoji0.54
2.52Headings1.10
0.01Transitions0.09
Based on 12 + 27 text responses
Research
What we learned reading every model
FAQ
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