GPT-5.4 Nano vs OpenAI: GPT-5.6 Luna
Compare GPT-5.4 Nano and OpenAI: GPT-5.6 Luna, both from OpenAI, context windows of 400K vs 1.1M, tested across 53 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Luna
GPT-5.4 NanoRunner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Luna has the edge — bigger model tier, newer, bigger context window.
GPT-5.4 Nano is 4.8x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
GPT-5.4 Nano
Input
$0.20
5.0× cheaper
Output
$1.25
4.8× cheaper
OpenAI: GPT-5.6 Luna
Input
$1.00
Output
$6.00
GPT-5.4 Nano is cheaper on both — 5.0× input, 4.8× output
Writing DNA
Style Comparison
Similarity
53%
GPT-5.4 Nano
OpenAI: GPT-5.6 Luna
51%Vocabulary59%
21wSentence Length19w
0.58Hedging0.84
7.1Bold2.7
5.5Lists4.5
0.01Emoji0.00
1.39Headings1.20
0.05Transitions0.10
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
