Claude Haiku 4.5 vs OpenAI: GPT-5.6 Luna
Compare Claude Haiku 4.5 by Anthropic against OpenAI: GPT-5.6 Luna by OpenAI, context windows of 200K vs 1.1M, tested across 53 shared challenges.
Our Verdict
Claude Haiku 4.5
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 Haiku 4.5
Input
$1.00
Output
$5.00
1.2× cheaper
OpenAI: GPT-5.6 Luna
Input
$1.00
Output
$6.00
Writing DNA
Style Comparison
Similarity
57%
Claude Haiku 4.5 uses 20.4x more emoji
Claude Haiku 4.5
OpenAI: GPT-5.6 Luna
61%Vocabulary59%
47wSentence Length19w
0.64Hedging0.84
5.1Bold2.7
6.3Lists4.5
0.20Emoji0.00
2.46Headings1.20
0.17Transitions0.10
Based on 24 + 27 text responses
Research
What we learned reading every model
FAQ
