Anthropic removed model-card copy covering Claude Fable 5, Mythos 5, and Project Glasswing.

Builder references to these model names and access routes no longer match the monitored page.

The removed copy said Fable 5 was generally available June 9, 2026, while Mythos 5 was limited availability.

• Aug 20, 2026Anthropic made the Files API generally available on the Claude API without the beta header.
• Aug 20, 2026Agent Skills and the Skills API are generally available on the Claude API.
• Aug 20, 2026Claude Managed Agents in self-hosted sandboxes can now attach memory stores.

This is the world we build in. It moves this fast. We move with it.