How Anthropic Builds: Lessons from Labs — Mike Krieger, Anthropic
Anthropic's Mike Krieger left CPO role to build with AI as Fable and predecessor Mythos emerged
“I actually just need to shift. It's like way too interesting a time.”
Mike Krieger, co-founder of Instagram and former Anthropic CPO, describes transitioning to an IC role driven by FOMO watching others build with models, coinciding with internal previews of what became Mythos and Fable. He identifies a key paradigm shift in AI-assisted engineering: moving from step-by-step task delegation toward describing end-state goals and letting the model determine implementation trade-offs. The mention of 'Mythos' as a predecessor to Fable offers rare visibility into Anthropic's internal model progression.