Technology
Claude Fable 5 is Anthropic's most capable public AI model, and will hand your conversation to a weaker model the moment it detects a biology or chemistry question — Anthropic admits the net is overly broad and plans to narrow it
On Tuesday, Anthropic released Claude Fable 5, the first publicly available model in its Mythos class — a family the company had previously declined to release at all, citing the models' enhanced ability to identify and exploit software vulnerabilities.
By Silicon Canals Editorial Team · Jun 12, 2026