Anthropic launched Claude Fable 5 on June 9, 2026 — the first publicly available Mythos-class AI model, previously restricted to government-approved partners. Unlike earlier AI tools, Fable 5 operates autonomously for days, planning and delegating tasks without constant human input. A real-world example: Stripe used it to complete a two-month codebase migration in a single day. For Scrum and Agile teams, the implication is significant — this isn't a smarter chatbot, it's an agent capable of running Sprint backlog items end-to-end, fundamentally changing what "done" means. The article frames learning AI-Enhanced Scrum as an immediate professional priority, pointing readers to AgileAIDev.com for training.