# Chai Discovery Raises $400M Series C at $3.8B Valuation

> Chai Discovery has raised a $400 million Series C led by Index Ventures alongside Kleiner Perkins, Sequoia, and Dimension, roughly tripling its valuation to $3.8 billion just seven months after a $1.3 billion Series B. The company builds AI models for molecular design, the increasingly crowded but genuinely consequential effort to predict how proteins and drug candidates behave before anyone runs a lab experiment. What gives the round weight is the customer list. Chai says its tools are already used by Eli Lilly and Pfizer for drug discovery, which is the kind of validation that separates AI-for-biology companies with real pipelines from those with impressive demos. Its earlier backers, including Thrive Capital, OpenAI, and Menlo Ventures, all returned for this round. A near-tripling of valuation in seven months is aggressive, and it reflects how much investors are betting that computational molecular design becomes core infrastructure for pharma. The interesting test now is whether Chai's models translate into drugs that actually reach patients, which is the only benchmark that ultimately matters in this field.

_Section: [AI Funding Tracker](https://www.wortins.com/funding) · Source: Business Wire · Published Monday, August 3, 2026_

## Wortins' read

Chai Discovery has raised a $400 million Series C led by Index Ventures alongside Kleiner Perkins, Sequoia, and Dimension, roughly tripling its valuation to $3.8 billion just seven months after a $1.3 billion Series B. The company builds AI models for molecular design, the increasingly crowded but genuinely consequential effort to predict how proteins and drug candidates behave before anyone runs a lab experiment. What gives the round weight is the customer list. Chai says its tools are already used by Eli Lilly and Pfizer for drug discovery, which is the kind of validation that separates AI-for-biology companies with real pipelines from those with impressive demos. Its earlier backers, including Thrive Capital, OpenAI, and Menlo Ventures, all returned for this round. A near-tripling of valuation in seven months is aggressive, and it reflects how much investors are betting that computational molecular design becomes core infrastructure for pharma. The interesting test now is whether Chai's models translate into drugs that actually reach patients, which is the only benchmark that ultimately matters in this field.

## Source

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

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