Claude Fable 5 vs OpenAI: GPT-5.6 Luna
Compare Claude Fable 5 by Anthropic against OpenAI: GPT-5.6 Luna by OpenAI, in 3 community votes, claude fable 5 and openai: gpt-5.6 luna are closely matched, context windows of 1.0M vs 1.1M, tested across 54 shared challenges.
Web Design: Claude Fable 5 and OpenAI: GPT-5.6 Luna are tied
Our Verdict
Claude Fable 5
OpenAI: GPT-5.6 Luna
Genuinely even. Both are strong choices.
OpenAI: GPT-5.6 Luna is 8.3x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Fable 5
Input
$10.00
Output
$50.00
OpenAI: GPT-5.6 Luna
Input
$1.00
10× cheaper
Output
$6.00
8.3× cheaper
OpenAI: GPT-5.6 Luna is cheaper on both — 10× input, 8.3× output
Writing DNA
Style Comparison
Similarity
58%
Claude Fable 5 uses 58.2x more emoji
Claude Fable 5
OpenAI: GPT-5.6 Luna
60%Vocabulary59%
22wSentence Length19w
0.49Hedging0.84
4.0Bold2.7
3.5Lists4.5
0.58Emoji0.00
1.09Headings1.20
0.05Transitions0.10
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
