The LLM Data Company
The LLM Data Company is a YC Spring 2025 (P25) company. Based in San Francisco, CA, USA. Team of 3.
About The LLM Data Company
Summary
The LLM Data Company researches post-training data for frontier AI models, producing bespoke tasks, reward signals, and training environments at scale. It works directly with frontier AI teams, replacing ad-hoc internal data curation with purpose-built pipelines tailored to specific model behaviors. Its work feeds the reinforcement and fine-tuning stages that shape how large models reason and act.
Go-to-market
Frontier AI labs are the primary customers, engaged through direct research partnerships rather than self-serve channels.
From the Y Combinator listing
Post-training Data Research
The LLM Data Company is a research lab studying post-training data. We work with frontier AI teams to create bespoke tasks, rewards, and environments for models to play and learn at scale.
Facts
- B2B / B2B
- San Francisco, CA, USA
- 3
- Active
- Early
Founders (3)
- Joseph Besgen
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