If you thought AI progress was slowing down, well here's the immediate answer to that. Huge jump in capability across the board. This is goi…

If you thought AI progress was slowing down, well here's the immediate answer to that. Huge jump in capability across the board. This is going to deliver major improvement in agents across almost all knowledge work categories. Introducing Claude Fable 5: a Mythos-class model that we’ve made safe for general use. Its capabilities exceed those of any model we’ve ever made generally available.

Source: Boris Cherny (X) | 2026-06-09