🚀 AI agents can now handle even longer, harder coding and science work with less babysitting. Title: Introducing Claude Fable 5.1 and Claude Mythos 5.1 URL: 📊 Overview Anthropic released two new models built on the same underlying model with different safety configurations: Claude Fable 5.1 (general availability) and Claude Mythos 5.1 (restricted, vetted access). 🎯 Problem Solved The release targets three challenges: maintaining reasoning quality during long unattended runs, stronger self-verification in complex workflows, and reducing safety false positives that hurt legitimate users. 🔬 Methodology and Approach Mythos 5.1 is limited to vetted professionals through the Cyber Verification Program and Life Sciences Verification Program, while Fable 5.1 ships broadly as the standard model. New Enterprise Frontier Safeguards add zero data retention, and new anti-distillation protections block illicit capability extraction. 📈 Results Agentic scientific research benchmark scores jumped from 24.7% to 52.6%, and agentic coding scores from 42.0% to 55.8%. The model designed protein binders with 10x the affinity of competition winners and produced a new high-resolution Venus elevation map. Cache read pricing dropped 75%. #ClaudeFable# #AIAgents#