Market landscapes / Model Development
Reinforcement Learning & Post-Training companies
What happens to a model after the first training run. Reinforcement learning environments, post-training, and the infrastructure for improving a model continuously rather than shipping it once. PrimeIntellect, Adaptive ML, AgileRL and others. 14 companies, none acquired, and it is one of the newest parts of this map.
Updated 12 October 2026
14 companies
12 hiring now
The rest of the Model Development landscape
The full map, including the sub-sectors too small to list separately.
The whole Model Development mapFoundation Model Labs 32AI Research Labs (Reasoning, Interpretability, Safety) 22Model Training & Fine-Tuning 16
I am Ben Jackson. I map this market and I hire the commercial teams inside it: sales, marketing, product and delivery. If you are building a team in Reinforcement Learning & Post-Training, here is how I work. The whole market in numbers.