Prompting Claude Fable 5 (opens in new tab)

Behavioral differences and prompting patterns for Claude Fable 5 and Claude Mythos 5, covering effort, instruction following, long runs, memory, and scaffolding changes. --- This guide covers the prompting and scaffolding patterns specific to Claude Fable 5 and Claude Mythos 5. For the model's capabilities, API changes, pricing, and availability, see Introducing Claude Fable 5 and Claude Mythos 5. For techniques that apply across all current Claude models, see Prompting best practices. Cla...