Claude Opus 4.7 vs OpenAI: GPT-5.6 Luna Pro
Compare Claude Opus 4.7 by Anthropic against OpenAI: GPT-5.6 Luna Pro by OpenAI, context windows of 1.0M vs 1.1M, tested across 54 shared challenges.
Our Verdict
Claude Opus 4.7
OpenAI: GPT-5.6 Luna Pro
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 Pro is 4.2x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.7
Input
$5.00
Output
$25.00
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
5.0× cheaper
Output
$6.00
4.2× cheaper
OpenAI: GPT-5.6 Luna Pro is cheaper on both — 5.0× input, 4.2× output
Writing DNA
Style Comparison
Similarity
59%
OpenAI: GPT-5.6 Luna Pro uses 2.6x more transitions
Claude Opus 4.7
OpenAI: GPT-5.6 Luna Pro
64%Vocabulary58%
20wSentence Length18w
0.51Hedging0.81
4.6Bold2.9
3.8Lists5.1
0.86Emoji0.54
1.60Headings1.10
0.03Transitions0.09
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
