AI path · course 34 of 142

Claude Fable 5.1 and the Frontier Model Class

Intermediate · 5 lessons · 0 complete

A focused look at where Anthropic's model lineup stands as of September 2026: what Claude Fable 5.1 is built for, how Opus 5 changes the cost calculus, what the 'Mythos-class' capability tier actually means, and a practical framework for choosing between them on real projects instead of always reaching for the flagship.