GPT-4.5 vs OpenAI: GPT-5.6 Luna
Compare GPT-4.5 and OpenAI: GPT-5.6 Luna, both from OpenAI, context windows of 128K vs 1.1M, tested across 24 shared challenges.
Our Verdict
GPT-4.5
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 25x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
GPT-4.5
Input
$75.00
Output
$150.00
OpenAI: GPT-5.6 Luna
Input
$1.00
75× cheaper
Output
$6.00
25× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 75× input, 25× output
Writing DNA
Style Comparison
Similarity
66%
GPT-4.5 uses 5.4x more transitions
GPT-4.5
OpenAI: GPT-5.6 Luna
63%Vocabulary59%
16wSentence Length19w
0.57Hedging0.84
4.7Bold2.7
6.4Lists4.5
0.00Emoji0.00
1.30Headings1.20
0.54Transitions0.10
Based on 11 + 27 text responses
Research
What we learned reading every model
FAQ
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