Who are Epsilab's investors?

Epsilab's investors include Y Combinator.

Where is Epsilab headquartered?

Epsilab is headquartered in San Francisco, US.

Epsilab

YC F26

San Francisco, US · Founded 2026 · 4 employees · 1 known investors

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Epsilab is an applied AI research lab that builds reinforcement learning environments from real-world data to support frontier model training, with work spanning environment simulation, long-horizon workflows, and multi-agent systems. It serves teams developing and evaluating large AI models.

AI & Machine Learning Enterprise Software Machine Learning Reinforcement Learning B2B Data Labeling AIUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (F26)

Evan Hu FounderCo-founder of Epsilab and previously co-founder and CTO of Shortbread (YC W23). He studied EECS at UC Berkeley, graduating in 2024.

Matthew Olsen FounderFounder of Epsilab, which develops reinforcement learning environments for training agents on real workflows and ultra-long-horizon tasks.

Fengjiao PengFounderFounder of Epsilab. She previously co-founded Shortbread (YC W23), an AI comics platform, and worked as an ML researcher at the MIT Media Lab.

Joanne Wang FounderCofounder of Epsilab (YC F26). Previously cofounded Copper Health (YC W24).

Investors · 1

Y Combinatorlisted by Y CombinatorSan Francisco · $500K

How we know: the Y Combinator directory · Not right? Tell us

Founder mafia

2 people who came through Epsilab went on to found or lead other companies.

Fengjiao PengFounderFounded Shortbread Joanne WangFounderFounded Copper Health

Frequently asked questions

What does Epsilab do?: Epsilab is an applied AI research lab that builds reinforcement learning environments from real-world data to support frontier model training, with work spanning environment simulation, long-horizon workflows, and multi-agent systems. It serves teams developing and evaluating large AI models.
Who are Epsilab's investors?: Epsilab's investors include Y Combinator.
Where is Epsilab headquartered?: Epsilab is headquartered in San Francisco, US.