Claude Fable 5.1 is generally available in GitHub Copilot

Claude Fable 5.1 becomes generally available in GitHub Copilot, letting developers select the model across VS Code, JetBrains, CLI and mobile. Anthropic’s Mythos‑class model is billed per usage and defaults to data retention for safety, with an optional zero‑retention exemption for eligible enterprises. Access requires admins to enable the policy in Copilot settings.