Epsilab
<!-- hacklab:yc-profile -- YC company profile Long horizon RL environments from real-life data Applied AI research lab focused on RL for frontier model training. Our research an…
About Epsilab
YC company profile
Long horizon RL environments from real-life data
Applied AI research lab focused on RL for frontier model training. Our research and evals cover real-world environment simulation, long-horizon workflows, and multi-player agents, etc.
- YC batch: Fall 2026
- Founded: 2026
- Team size: 4
- Location: San Francisco
- Country: US
- Status: Active
- Industry: B2B
- Stage: Early
- Tags: Machine Learning, Reinforcement Learning, B2B, Data Labeling, AI
- YC partner: Pete Koomen
Founders
Evan Hu — Founder
Co-founder at Epsilab (F26). Previously co-founder and CTO at Shortbread (YC W23). Berkeley EECS '24
Matthew Olsen — Founder
Founder at Epsilab - building RL environments for training agents on real workflows and ultra-long-horizon tasks.
Fengjiao Peng — Founder
Cofounder at Epsilab. Previously co-founded Shortbread (YC W23), generating $500K revenue and 2M episodes sold for AI-created comics. ML Researcher at MIT Media Lab.
Joanne Wang — Founder
Cofounder of Epsilab (F26). 2nd time YC founder - previously built Copper Health (W24).
Source: Y Combinator · Retrieved 2026-11-02. Company information is self-reported on YC.