Fable is more precisely Claude Fable 5 from Anthropic, a high-capability branch within the Claude family. It is useful to track separately because it represents a Claude route aimed at large coding projects, complex implementations, multi-step autonomous work, and stricter safety controls.

The key question around Fable is not simply whether it is more capable, but how highly capable models are constrained, audited, and deployed safely. It belongs in the model directory because longer-running, more autonomous model behavior changes product design, permission boundaries, regulation, and enterprise procurement.