Anthropic’s Claude Fable 5 plays it too safe on safety, developers say

Anthropic on Tuesday launched Claude Fable 5 , its most capable public model. But within two days, users began reporting that its safety system was blocking benign or legitimate prompts. Fable 5 is the first public model derived from Anthropic’s Mythos family, whose original iteration showed unusual skill during training at finding software bugs and exploiting them to disrupt or take control of systems.