AfterQuery
AfterQuery is a YC Winter 2025 (W25) company. Based in San Francisco, CA, USA. Team of 20.
About AfterQuery
Summary
AfterQuery builds expert-curated training datasets for frontier AI model development. It captures how domain professionals reason through decisions, tradeoffs, and context, then structures that thinking into supervised fine-tuning data, reinforcement learning rubrics, agent environments, and computer-use trajectories. The product replaces lower-quality, output-only data pipelines that cause model performance to plateau on complex, real-world tasks.
Business model
Data products sold to AI research labs and enterprises building foundation models.
Go-to-market
Frontier AI research labs and enterprises are the buyers; customers engage directly through a "Get data" intake flow on the website.
From the Y Combinator listing
Research lab investigating the boundaries of AI capabilities.
AfterQuery is a research lab (backed by Y Combinator) investigating the boundaries and capabilities of artificial intelligence through novel datasets and experimentation. We believe that pushing the frontiers of AI requires both rigorous scientific inquiry and exceptional human data.
Facts
- B2B / B2B -> Infrastructure
- San Francisco, CA, USA
- 20
- Active
- Early
Founders (3)
- Danny Tang
Score every batch against your own thesis
GPAgent's sourcing agent reads every company in a batch, scores each one against your fund's thesis in a private workspace, and lines up the founders worth meeting before Demo Day. You decide who to contact. Your scores, notes, and pipeline never appear on these pages.
How Accelerator intelligence works