What they do:
build AI NPCs
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HQ: Los Angeles, CA, United States
Top Reinforcement Learning Startups
This list has 48 startups and was last updated on Oct 15, 2026. 7 of them are hiring right now. Largest teams: rct AI, HUD, and Sepal AI.
48 startupsPage 1 of 2
HUD
Hiring
What they do:
Platform and marketplace for RL environments and AI data
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HQ: San Francisco, CA, United States
idler
Hiring
What they do:
Hill-climb any benchmark, for any model, in any domain.
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HQ: San Francisco, CA, United States
Osmosis
Hiring
What they do:
Reinforcement Learning (RL) for AI Agents
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HQ: San Francisco, CA, United States
TrainLoop
Hiring
What they do:
Reasoning Fine-Tuning
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HQ: San Francisco, CA, United States
Ooak Data
Hiring
What they do:
We turn company data into training data
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HQ: San Francisco, CA, United States
JustAI
Hiring
What they do:
Agentic Marketing Platform
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HQ: San Francisco, CA, United States
What they do:
Robot Cowboys that Herd Cattle with AI Drones
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What they do:
Specialized AI for Every Job
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HQ: San Francisco, CA, United States
What they do:
Autonomously scaling environments
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HQ: San Francisco, CA, United States
What they do:
Frontier Data
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HQ: San Francisco, CA, United States
What they do:
Earned intelligence for every company
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HQ: San Francisco, CA, United States
What they do:
Product Native Models
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HQ: San Francisco, CA, United States
What they do:
Training Data for Recursive Self-Improvement
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HQ: San Francisco, CA, United States
What they do:
Models that keep learning
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HQ: London, United Kingdom
What they do:
Platform to automate manual back-office work
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HQ: San Francisco, CA, United States
What they do:
Continual Learning for Agents
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HQ: San Francisco, CA, United States
What they do:
Specialized AI for Critical Industries
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HQ: San Francisco, CA, United States
What they do:
Large-scale real-world robot & human data for embodied AI
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HQ: San Francisco, CA, United States
What they do:
Turns real businesses into robotics data vendors
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HQ: San Francisco, CA, United States
What they do:
We find flaws in RL environments and evals and help you fix them.
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HQ: San Francisco, CA, United States
What they do:
Internal industrial company data for frontier labs
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HQ: San Francisco, CA, United States
What they do:
RL post-training for science reasoning and performance engineering
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HQ: San Francisco, CA, United States
What they do:
Autoresearch as a service: we solve your hardest measurable problems
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HQ: San Francisco, CA, United States
What they do:
Prompt and Context Optimization for Coding Agents
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HQ: San Francisco, CA, United States
What they do:
Environments for Long Horizon Work
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HQ: San Francisco, CA, United States
What they do:
Foundational model research
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HQ: San Francisco, CA, United States
What they do:
Building reinforcement learning environments
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HQ: San Francisco, CA, United States
What they do:
Physics-based foundation models for CAD optimization.
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HQ: San Francisco, CA, United States
What they do:
Enterprise post-training, monitoring, and continual learning platform
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HQ: San Francisco, CA, United States
What they do:
Infrastructure for Autonomous Science
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HQ: San Francisco, CA, United States
What they do:
Crafting simulations for frontier lab model training
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HQ: San Francisco, CA, United States
What they do:
The autonomous AI model factory
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HQ: San Francisco, CA, United States
What they do:
Real-world RL environments for robotics models
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HQ: San Francisco, CA, United States
What they do:
Training the world's best AI model for quantitative finance.
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HQ: San Francisco, CA, United States
What they do:
Quant Neolab building self-improving agents from quant data
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HQ: San Francisco, CA, United States
Questions and answers
How many startups are on this list?
There are 48 startups on this list, last updated on Oct 15, 2026.
Which of them are hiring?
7 of them are hiring right now, including HUD, idler, and Osmosis.
Which of them have the largest teams?
By team size: rct AI (40 employees), HUD (24 employees), and Sepal AI (15 employees).