Claude 3 Opus vs OpenAI: GPT-5.6 Luna Pro
Compare Claude 3 Opus by Anthropic against OpenAI: GPT-5.6 Luna Pro by OpenAI, context windows of 200K vs 1.1M, tested across 12 shared challenges.
Our Verdict
Claude 3 Opus
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 3 Opus
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
52%
OpenAI: GPT-5.6 Luna Pro uses 286.7x more bold
Claude 3 Opus
OpenAI: GPT-5.6 Luna Pro
54%Vocabulary58%
14wSentence Length18w
0.48Hedging0.81
0.0Bold2.9
3.0Lists5.1
0.00Emoji0.54
0.00Headings1.10
0.06Transitions0.09
Based on 3 + 27 text responses
Research
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