AfterQuery
AfterQuery provides expert-curated datasets and reinforcement learning environments for frontier AI models.
- 167
- San Francisco, CA, USUnited States
AfterQuery provides expert-curated datasets and reinforcement learning environments for frontier AI models.
afterquery.comCrawled Oct 15, 2026
Explore AfterQuery products for rubric- and verifier-based RL, tool-calling environments, supervised fine-tuning, and preference training.
Custom evals and benchmarks, proprietary datasets, post-training, and forward-deployed engineering across the full model lifecycle.
OpenAI’s DeployCo and Anthropic’s ServiceCo signal that enterprise AI’s next battleground is the last mile — implementation and operating context, not just model capability.
NVIDIA publicly used AfterQuery’s Off-The-Shelf Office Agent Training Dataset to improve Nemotron 3 Ultra on GDPval — the only data vendor named in their technical report, worth 11.4 GDPval points in their warmup ablation.
On-policy reverse-KL distillation lifted Nemotron-3-Nano’s GDPval rubric score by 5.1 points in 50 steps — a +20.9% net win-loss margin — and the same recipe reproduced on Qwen3.5-9B for +21.4%.
Join AfterQuery in San Francisco and help build the expert data, evaluation systems, and reinforcement-learning environments that shape AI.
AfterQuery captures how experts reason and turns real-world professional work into high-quality training data for frontier foundation models.
AfterQuery, an AI training-data startup, reportedly secures a round at a $3.2 billion valuation. The valuation is more than 10 times its April valuation, and Y Combinator partner Gustaf Alströmer says it is the fastest any startup has reached unicorn status in the accelerator’s history. In April, AfterQuery reported a $100 million annualized revenue run rate and named Nvidia, Legora, and Motif Technologies as customers. The company trains models and agents to perform professional tasks by encoding practitioners’ patterns, decisions, and reasoning.
Sep 2026TechCrunchNews article
AfterQuery, which sells coding and finance training data to AI labs, reaches a $3.2 billion valuation after pivoting its Y Combinator startup. The company is profitable, up from a $300 million valuation in April, and 23-year-old Spencer Mateega has made it the fastest unicorn in Y Combinator’s history.
Sep 2026ForbesNews article
AfterQuery announces a partnership with The Raine Group to make the firm’s institutional knowledge structured and searchable through a new enterprise AI tool. The tool is tailor-made to complement existing workflows and is intended to support AI deployment across the firm.
Apr 2026AfterQuery BlogNews article
AfterQuery is the subject of a Forbes profile covering its founders and revenue run rate. The piece also discusses the company's Series A financing and competition in the AI data-labeling market.
Apr 2026ForbesNews article
