# Chai Discovery Raises $400M Series C for AI Molecular Drug Discovery

> Chai Discovery has raised a 400 million dollar Series C at a 3.8 billion dollar valuation, led by Index Ventures with Kleiner Perkins and Sequoia joining, to push its AI models for predicting how molecules interact. The company sits in the increasingly crowded field trying to use machine learning to find promising drug candidates faster than traditional lab work allows. The core idea is that if a model can accurately predict how a candidate molecule will bind to a biological target, researchers can screen and design drugs computationally before committing to expensive wet-lab experiments. That could compress the earliest and most uncertain stage of drug discovery, where the vast majority of candidates fail. The size of the round says as much about the moment as the company. Investors are pouring money into AI-for-biology on the belief that molecular prediction is where AI delivers concrete scientific value, not just chat. Chai now has the capital to prove that its models translate into real drugs, which is the bar the whole field still has to clear.

_Section: [Daily AI Updates](https://www.wortins.com/daily-ai) · Source: BusinessWire · Published Wednesday, July 15, 2026_

## Wortins' read

Chai Discovery has raised a 400 million dollar Series C at a 3.8 billion dollar valuation, led by Index Ventures with Kleiner Perkins and Sequoia joining, to push its AI models for predicting how molecules interact. The company sits in the increasingly crowded field trying to use machine learning to find promising drug candidates faster than traditional lab work allows. The core idea is that if a model can accurately predict how a candidate molecule will bind to a biological target, researchers can screen and design drugs computationally before committing to expensive wet-lab experiments. That could compress the earliest and most uncertain stage of drug discovery, where the vast majority of candidates fail. The size of the round says as much about the moment as the company. Investors are pouring money into AI-for-biology on the belief that molecular prediction is where AI delivers concrete scientific value, not just chat. Chai now has the capital to prove that its models translate into real drugs, which is the bar the whole field still has to clear.

## Source

[Read the full story at BusinessWire](https://www.businesswire.com/news/home/20260713849009/en/Chai-Discovery-Announces-$400M-Series-C-to-Advance-AI-Driven-Molecular-Design)

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