Claude Fable 5 vs GPT-5.4
Compare Claude Fable 5 by Anthropic against GPT-5.4 by OpenAI, context windows of 1.0M vs 1.1M, tested across 53 shared challenges.
Our Verdict
Claude Fable 5
GPT-5.4
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT-5.4 is 3.3x 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
GPT-5.4
Input
$2.50
4.0× cheaper
Output
$15.00
3.3× cheaper
GPT-5.4 is cheaper on both — 4.0× input, 3.3× output
Writing DNA
Style Comparison
Similarity
53%
Claude Fable 5 uses 58.2x more emoji
Claude Fable 5
GPT-5.4
60%Vocabulary54%
22wSentence Length28w
0.49Hedging0.69
4.0Bold4.1
3.5Lists8.1
0.58Emoji0.00
1.09Headings1.84
0.05Transitions0.02
Based on 27 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
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