GPT-5.4 Pro vs OpenAI: GPT-5.6 Luna
Compare GPT-5.4 Pro and OpenAI: GPT-5.6 Luna, both from OpenAI, context windows of 1.1M vs 1.1M, tested across 18 shared challenges.
Our Verdict
GPT-5.4 Pro
OpenAI: GPT-5.6 Luna
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
OpenAI: GPT-5.6 Luna 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
OpenAI: GPT-5.6 Luna
Input
$1.00
30× cheaper
Output
$6.00
30× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 30× input, 30× output
Writing DNA
Style Comparison
Similarity
68%
OpenAI: GPT-5.6 Luna uses 9.9x more transitions
GPT-5.4 Pro
OpenAI: GPT-5.6 Luna
50%Vocabulary59%
35wSentence Length19w
0.70Hedging0.84
7.5Bold2.7
8.3Lists4.5
0.00Emoji0.00
2.52Headings1.20
0.01Transitions0.10
Based on 12 + 27 text responses
Research
What we learned reading every model
FAQ
