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YCS25· AI

b12 Labs

Making hard molecules for Pharma and Biotech

ActiveChecked 18h ago
Batch
S25
Status, per YC
Active
Team size
3
HQ
San Francisco, CA
In S25166 companies, 92% AI

Founders

  • Zlatko JončevFounder/CEO
  • Andres BranFounder/CTO

Same space

About b12 Labs

b12 makes high-value molecules that are otherwise hard to make. We help pharma companies plan and make new drugs, accelerating early-stage drug discovery from years to months. Andres built the first AI agent that can autonomously think and make molecules in a robotic lab, published in Nature Machine Intelligence (1000+ citations), and won the best paper award at the NeurIPS AI for Science conference. Zlatko is a 3x National Chemistry Olympiad champion, competed at IChO level, and medicinal chemist who has worked at Roche and leading lab robotics companies. Combined, we have an extensive network of hundreds of chemists, automation scientists, and AI 4 Science researchers. We run paid pilots with big pharma companies, demonstrating that our platform planned a set of experiments that achieved full conversion in a single attempt, eliminating the iteration cycle.

San Francisco, CA, USA

b12 Labs: questions

Which YC batch was b12 Labs in?

b12 Labs was in Y Combinator's Summer 2025 batch (S25).

Is b12 Labs still active?

Y Combinator lists b12 Labs as active.

Who founded b12 Labs?

b12 Labs's founders, as listed on its YC page: Zlatko Jončev (Founder/CEO), Andres Bran (Founder/CTO).

Where is b12 Labs based?

b12 Labs lists San Francisco, CA, USA as its location on YC's directory.

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