Anthropic’s two 5.1 configurations share model weights but not safeguards. Fable 5.1 is the broadly available option with effort and cache controls; Mythos 5.1 is reserved for vetted organizations and trusted research programs.
Centralize team tasks and communication
Create and test AI prompts
All-in-one workspace with mind maps, whiteboards, chat, and document editing
Desktop app for writing, images, and video in one place
Pick up to 3 — we tailor the catalog. Change anytime.
