Anthropic Co-founder: Building Claude Code, Lessons From GPT-3 & LLM System Design

Anthropic Co-founder: Building Claude Code, Lessons From GPT-3 & LLM System Design

From Lightcone Podcast by Y Combinator

August 21, 2025 · 36 min

About this episode

Tom Brown discusses his journey from YC founder to AI researcher and shares insights on scaling laws and advice for young engineers.

Tom Brown co-founded Anthropic after helping build GPT-3 at OpenAI. A self-taught engineer, he went from getting a B-minus in linear algebra to becoming one of the key people behind AI's scaling breakthroughs. And his work is paying off. Today, Anthropic's Claude is the go-to choice for developers, and his team is overseeing what he calls "humanity's largest infrastructure buildout ever." On this episode of The Lightcone, he discusses his unconventional path from YC founder to AI researcher, the discovery of scaling laws that changed everything, and his advice for young engineers entering AI today.

People in this episode

Host: Y Combinator

Guest: Tom Brown

Topics covered

  • AI research
  • scaling laws
  • Claude
  • GPT-3
  • engineering advice
  • technology infrastructure

Keywords

  • Tom Brown
  • Anthropic
  • Claude
  • GPT-3
  • AI engineering
  • scaling breakthroughs
  • technology

Mentioned in this episode

Organizations: Anthropic, OpenAI

Products: Claude

Books & works: The Lightcone

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