AfterQuery is a Y Combinator (W25) applied research lab that builds high-quality, expert-generated training datasets, RL environments, and evaluation tooling for frontier AI labs. With a network of nearly 100,000 domain experts — developers, attorneys, and other professionals — it competes with Mercor and Surge in the model-training data market.

Company Profile

Investors

Products

• Expert-curated training datasets
• Reinforcement-learning agent environments
• AI evaluation infrastructure

Competitors

AIData LabelingY CombinatorRL Environments

Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2026-Q2. Refreshed quarterly.