https://www.anthropic.com/news/claude-fable-5-mythos-5

• From today through June 22, Fable 5 is included on Pro, Max, Team, and seat-based Enterprise plans at no extra cost.

• On June 23, we’ll remove Fable 5 from those plans.

• After this point—when sufficient capacity allows us to do so—we aim to restore Fable 5 as a standard part of subscription plans. We intend to do this as quickly as we can.

When will Claude Fable be accessible to users on the Pro subscription as part of the regular usage quota?

Resolves to before July if it's never removed.

Claude Fable 5 and Claude Mythos 5

Today we’re launching Claude Fable 5: a Mythos-class model that we’ve made safe for general use.