[X]score: 0.60
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 g…
June 9, 2026
Claude Fable 5 is now publicly available, positioned as Anthropic's most capable generally released model to date and described as "Mythos-class." No benchmark scores, parameter counts, or specific capability comparisons have been published alongside the announcement.