The Claude model list now includes "Opus 5.5." How does it differ from Opus 5, and is there a reason to choose it when a model as high-performing as Fable 5.1 exists? It is difficult to judge based on the name alone.

Anthropic on Tuesday unveiled a faster and cheaper version of its flagship artificial intelligence model that it also billed as its “safest,” in its first release since its chief executive called on t...