Technical ThinkersJeff Dean × Y Combinator · Jul 30, 2026 · 0:57:00
Jeff Dean: The 1% Rule for Building in AI
People:Jeff Dean
Tip: use the player's CC button to enable or switch subtitles; English captions are available on these videos.
Why it matters
Google legend Jeff Dean shares the '1% Rule': beyond model capability, data, evals, and engineering systems decide project success. 57 minutes of hard-won engineering wisdom.
Key takeaways
- The 1% Rule: the model is 1%; data and evals are the other 99%.
- Evals first: without good evals, AI projects spin in place.
- Systems thinking: design AI as a system, not a single call.
- For startups: build the data flywheel before upgrading models.
Original video
- Speaker
- Jeff Dean × Y Combinator
- Channel
- Y Combinator
- Venue
- YC Interview
- Date · Duration
- Jul 30, 2026 · 0:57:00
Jeff Dean: The 1% Rule for Building in AI
Watch the original on YouTube