Re the Fable ML sandbagging, the model's AI research capabilities were probably at least partly trained on Anthropic employees diffing atop proprietary algos and infra. So the IP leak is somewhat like a researcher who knows Anthropic's stack getting poached to another lab. Anthropic's recent "When AI builds itself" post talks about a next-step eval. Where they snapshot a research session at the moment a human researcher made a suboptimal next-step choice, show a model only the transcript up…