Claude 3 Sonnet vs OpenAI: GPT-5.6 Luna
Compare Claude 3 Sonnet by Anthropic against OpenAI: GPT-5.6 Luna by OpenAI, tested across 13 shared challenges.
Our Verdict
Claude 3 Sonnet
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.
Too close to call
API pricing
Cost per 1M tokens
Claude 3 Sonnet
Input
$3.00
Output
$15.00
OpenAI: GPT-5.6 Luna
Input
$1.00
3.0× cheaper
Output
$6.00
2.5× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 3.0× input, 2.5× output
Writing DNA
Style Comparison
Similarity
55%
OpenAI: GPT-5.6 Luna uses 275.0x more bold
Claude 3 Sonnet
OpenAI: GPT-5.6 Luna
48%Vocabulary59%
14wSentence Length19w
0.32Hedging0.84
0.0Bold2.7
3.6Lists4.5
0.00Emoji0.00
0.00Headings1.20
0.38Transitions0.10
Based on 4 + 27 text responses
Research
What we learned reading every model
FAQ
