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Sam McCandlish

co-founder at Anthropic
Active Founder · 1 1 company

About

Sam McCandlish is co-founder and Chief Architect of Anthropic, focusing on pre-training and large-scale model training following an October 2025 leadership restructuring. He previously served as Chief Science Officer and Chief Technology Officer at Anthropic since its 2021 founding. Before Anthropic he was a Research Lead at OpenAI from 2018 to 2020, where he contributed to foundational work on neural network scaling laws that predicted capabilities of models like GPT-3. He holds a PhD in theoretical physics from Stanford and undergraduate degrees in math and physics from Brandeis.

Career

1
Current
Anthropic
co-founder
AI safety lab building Claude — a helpful, harmless, honest

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