On the morning of June 9, 2026, Anthropic announced Claude Fable 5 and Claude Mythos 5 : one weight class, two release tracks. Fable 5 ships to everyone with consumer-grade safeguards; Mythos 5 stays restricted to Project Glasswing partners. It is the first time a Mythos-class model has been generally available.

What shipped on day one

General availability on the Claude API, the Claude Platform on AWS, Amazon Bedrock, Vertex AI, and Microsoft Foundry.
A GitHub Copilot rollout across Pro+, Max, Business, and Enterprise plans, per the GitHub changelog .
Launch pricing of $10 per million input tokens and $50 per million output, with the model included in paid Claude plans through June 22.

Why it matters

The launch turns a year of Mythos rumors into a product anyone can test. What the model actually is, and how the two-tier mechanic works, is covered in the Fable 5 explainer ; the practical getting-started path is in our access guide .