Claude Fable 5 vs OpenAI: GPT-5.6 Terra
Compare Claude Fable 5 by Anthropic against OpenAI: GPT-5.6 Terra by OpenAI, context windows of 1.0M vs 1.1M, tested across 54 shared challenges.
Our Verdict
Claude Fable 5
OpenAI: GPT-5.6 TerraRunner-up
No community votes yet. On paper, Claude Fable 5 has the edge — bigger model tier.
OpenAI: GPT-5.6 Terra 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
OpenAI: GPT-5.6 Terra
Input
$2.50
4.0× cheaper
Output
$15.00
3.3× cheaper
OpenAI: GPT-5.6 Terra is cheaper on both — 4.0× input, 3.3× output
Writing DNA
Style Comparison
Similarity
52%
Claude Fable 5 uses 58.2x more emoji
Claude Fable 5
OpenAI: GPT-5.6 Terra
60%Vocabulary57%
22wSentence Length18w
0.49Hedging0.85
4.0Bold2.8
3.5Lists4.6
0.58Emoji0.00
1.09Headings1.12
0.05Transitions0.06
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
