Claude Opus 4.1 vs OpenAI: GPT-5.6 Luna Pro
Compare Claude Opus 4.1 by Anthropic against OpenAI: GPT-5.6 Luna Pro by OpenAI, context windows of 200K vs 1.1M, tested across 53 shared challenges.
Our Verdict
Claude Opus 4.1
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 13x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.1
Input
$15.00
Output
$75.00
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
15× cheaper
Output
$6.00
13× cheaper
OpenAI: GPT-5.6 Luna Pro is cheaper on both — 15× input, 13× output
Writing DNA
Style Comparison
Similarity
55%
Claude Opus 4.1 uses 5.0x more sentence length
Claude Opus 4.1
OpenAI: GPT-5.6 Luna Pro
61%Vocabulary58%
87wSentence Length18w
0.54Hedging0.81
5.1Bold2.9
6.7Lists5.1
0.38Emoji0.54
1.68Headings1.10
0.13Transitions0.09
Based on 17 + 27 text responses
Research
What we learned reading every model
FAQ
