# How Superhuman Built AI Into a 100ms Product | Loïc Houssier

Page: https://stenobird.com/podcast/chain-of-thought-ai-agents/how-superhuman-built-ai-into-a-100ms-product-lo-c-houssier
Text version: https://stenobird.com/podcast/chain-of-thought-ai-agents/how-superhuman-built-ai-into-a-100ms-product-lo-c-houssier.md
Podcast: [Chain of Thought | AI Agents, Infrastructure & Engineering](https://stenobird.com/podcast/chain-of-thought-ai-agents)
Published: 2026-05-22T11:00:00+00:00
Episode link: https://share.transistor.fm/s/65e3c420
Audio file: https://media.transistor.fm/65e3c420/aef6a310.mp3
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JSON: https://stenobird.com/v1/public/podcasts/chain-of-thought-ai-agents/episodes/how-superhuman-built-ai-into-a-100ms-product-lo-c-houssier
Duration seconds: 3011

## Resource

Loïc Houssier, VP of Engineering at Superhuman (the email client Grammarly acquired for $825M in July 2025), explains how his team retrofitted AI features into a product whose entire brand promise is sub-100ms speed. He breaks down the model-routing strategy, the eval framework his PMs own, and why his team auto-drafts every reply but refuses to auto-send any of them.

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## Transcript

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