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Claude Fable 5
Claude Fable 5 is a large language model from Anthropic, released June 2026. Anthropic describes it as “Claude Fable 5 is a Mythos-class model from Anthropic, built for autonomous knowledge work and coding.”
36
replies recorded
3
questions answered
0
answers no other model gave
Fun facts
Asked to choose a pet, Claude Fable 5 gets a cat, 7 of 12 times.
Claude Fable 5’s canon
- Cat or dog
- “Cat”7 of 12
What it says every single time
Cat or dog, which it would rather be
“Cat”every single time
About Claude Fable 5
- Maker
- Anthropic · San Francisco
- Released
- June 2026
- Size
- large, by price class
- Context window
- 1,000,000 tokens
- Takes in
- text, image, file
- Also from Anthropic
- Claude Opus 5 · Claude Haiku 4.5 · Claude Sonnet 5 · Claude 3 Haiku · Claude Sonnet 4 · Claude Opus 4.8 · Claude Opus 4.6 · Claude Opus 4.5
Maker and release facts come from the model catalogue we call through, not from this site’s own studies. Catalogue facts as of 2026-09-06.
Everything on file
Every question this model has answered on Machine Canon, grouped by study. Open a study to see its answers; the answers no other model gave come first.
Each answer is the one this model gave most often to that question; the count shows how many of its replies matched. “No other model said this” means no other model’s most common answer matched. All numbers are computed from the retained research records by src/build_model_dossiers.py.
Music tests · September 2026
1 attempt · 0 completed answers · 1 technical failure
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