# Chai Discovery raises $400M Series C at $3.8B valuation for AI-powered drug discovery molecules

> Chai Discovery has raised a 400 million dollar Series C at a 3.8 billion dollar valuation, led by Index Ventures, in one of the drop's clearest bets on AI for science. The company builds models that predict molecular structures and interactions to speed up drug discovery. Its latest system, Chai-3, reportedly doubled the previous success rate for antibody design, and the traction is not just technical: Chai has struck licensing deals with pharmaceutical heavyweights including Eli Lilly, Pfizer, and Novartis. Those partnerships give the startup both revenue and validation from the industry it aims to serve. The raise reflects growing conviction that AI's biggest near-term payoff in the life sciences is accelerating the slow, expensive early stages of drug development, where better predictions can save years of lab work and vast sums of money.

_Section: [AI Funding Tracker](https://www.wortins.com/funding) · Source: FierceBiotech · Published Wednesday, August 12, 2026_

## Wortins' read

Chai Discovery has raised a 400 million dollar Series C at a 3.8 billion dollar valuation, led by Index Ventures, in one of the drop's clearest bets on AI for science. The company builds models that predict molecular structures and interactions to speed up drug discovery. Its latest system, Chai-3, reportedly doubled the previous success rate for antibody design, and the traction is not just technical: Chai has struck licensing deals with pharmaceutical heavyweights including Eli Lilly, Pfizer, and Novartis. Those partnerships give the startup both revenue and validation from the industry it aims to serve. The raise reflects growing conviction that AI's biggest near-term payoff in the life sciences is accelerating the slow, expensive early stages of drug development, where better predictions can save years of lab work and vast sums of money.

## Source

[Read the full story at FierceBiotech](https://www.fiercebiotech.com/biotech/chai-brews-400m-series-c-fuel-ai-used-lilly-novartis-and-pfizer)

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