GPT-3.5 Turbo vs GPT-5.6 Luna Pro
Compare GPT-3.5 Turbo and GPT-5.6 Luna Pro, both from OpenAI, context windows of 16K vs 1.1M, tested across 54 shared challenges.
Our Verdict
GPT-5.6 Luna Pro
GPT-3.5 TurboRunner-up
No community votes yet. On paper, GPT-5.6 Luna Pro has the edge — newer, bigger context window.
GPT-3.5 Turbo is 3.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-3.5 Turbo
Input
$1.50
Output
$2.00
3.0× cheaper
GPT-5.6 Luna Pro
Input
$1.00
1.5× cheaper
Output
$6.00
GPT-5.6 Luna Pro wins input (1.5× cheaper)·GPT-3.5 Turbo wins output (3.0× cheaper)
Writing DNA
Style Comparison
Similarity
49%
GPT-5.6 Luna Pro uses 286.7x more bold
GPT-3.5 Turbo
GPT-5.6 Luna Pro
61%Vocabulary58%
16wSentence Length18w
0.23Hedging0.81
0.0Bold2.9
3.7Lists5.1
0.00Emoji0.54
0.00Headings1.10
0.38Transitions0.09
Based on 11 + 27 text responses
Research
What we learned reading every model
FAQ
