Claude Opus 4.6 vs OpenAI: GPT-5.6 Luna
Compare Claude Opus 4.6 by Anthropic against OpenAI: GPT-5.6 Luna by OpenAI, context windows of 1.0M vs 1.1M, tested across 53 shared challenges.
Our Verdict
Claude Opus 4.6
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 4.2x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.6
Input
$5.00
Output
$25.00
OpenAI: GPT-5.6 Luna
Input
$1.00
5.0× cheaper
Output
$6.00
4.2× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 5.0× input, 4.2× output
Writing DNA
Style Comparison
Similarity
54%
Claude Opus 4.6 uses 20.7x more emoji
Claude Opus 4.6
OpenAI: GPT-5.6 Luna
53%Vocabulary59%
35wSentence Length19w
0.68Hedging0.84
5.2Bold2.7
2.9Lists4.5
0.21Emoji0.00
1.34Headings1.20
0.03Transitions0.10
Based on 23 + 27 text responses
Research
What we learned reading every model
FAQ
