Definition
Plain language
One of the AI models tested in these episodes.
As stated in the literature
A Claude-family model variant referenced in the evaluated agent configurations.
Also called: claude-fable-5, Claude Fable 5.1, Fable 5.1
Why it matters: It shows that a model can be deliberately tuned toward unusual, varied answers, which matters when you want creativity or breadth rather than the safest common response.
For example, asked to name a fruit, Fable 5 might answer "quince" while most other models say "apple."
Heard on the show
“The script was written by Anthropic's Claude Fable 5.”Episode 127 — What Diffusion Language Models Were Missing: A Map, Not an Algorithm