Exa: Organizing the World’s Knowledge

Exa is one of the most ambitious startups in search, taking on a problem Google never fully solved. Fresh off an $85M Series B at a $700M valuation, its mission is bold: to organize the world’s knowledge once and for all. Will Bryk, co-founder and CEO of Exa, sat down with YC General Partner Nicolas Dessaigne to share how his team is building a search engine from scratch — for the systems that will shape the future. Learn more about Exa at https://exa.ai. Apply to Y Combinator: https://ycombinator.com/apply Chapters: 00:00 – Intro & Exa’s $85M Series B raise 01:15 – What Exa is building: a search engine for AI 03:10 – Why Google never finished its mission 05:05 – Early pivot moments and lessons from YC 08:00 – The shift from developer tool to AI infrastructure 11:20 – How AI agents use Exa behind the scenes 14:05 – Organizing the world’s knowledge “for real” 17:30 – Competing in a post-Google search world 21:15 – Scaling Exa’s technology and reliability 25:40 – The hidden layer powering intelligence

Nicolas DessaignehostWill Brykguest

Sep 3, 202518mWatch on YouTube ↗

EPISODE INFO

Released: September 3, 2025
Duration: 18m
Channel: YC Root Access
Watch on YouTube: ▶ Open ↗

EPISODE DESCRIPTION

Exa is one of the most ambitious startups in search, taking on a problem Google never fully solved. Fresh off an $85M Series B at a $700M valuation, its mission is bold: to organize the world’s knowledge once and for all. Will Bryk, co-founder and CEO of Exa, sat down with YC General Partner Nicolas Dessaigne to share how his team is building a search engine from scratch — for the systems that will shape the future. Learn more about Exa at https://exa.ai. Apply to Y Combinator: https://ycombinator.com/apply Chapters: 00:00 – Intro & Exa’s $85M Series B raise 01:15 – What Exa is building: a search engine for AI 03:10 – Why Google never finished its mission 05:05 – Early pivot moments and lessons from YC 08:00 – The shift from developer tool to AI infrastructure 11:20 – How AI agents use Exa behind the scenes 14:05 – Organizing the world’s knowledge “for real” 17:30 – Competing in a post-Google search world 21:15 – Scaling Exa’s technology and reliability 25:40 – The hidden layer powering intelligence

SPEAKERS

Nicolas Dessaigne
host
Host on YC Root Access who interviews startup founders and operators.
Will Bryk
guest
Co-founder and CEO of Exa.ai, an AI-native web search engine/API for agents.

EPISODE SUMMARY

In this episode of YC Root Access, featuring Nicolas Dessaigne and Will Bryk, Exa: Organizing the World’s Knowledge explores exa builds AI-native web search infrastructure to organize knowledge at scale Exa positions itself as a search engine built for AIs—supporting long, complex queries, high result volumes, and deep customization rather than human-centric UI and ads.

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