Anthropic Launches Claude Fable 5.1 and Claude Mythos 5.1 Models
Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1, its most advanced models for coding and knowledge work. Fable 5.1 reduces typical workload costs by 25% and highly agentic task costs by 45% through cheaper cache reads. The company also introduced Enterprise Frontier Safeguards for data privacy and improved safety classifiers to reduce false-positive interventions in cybersecurity and biology.

