Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

RunRL

Active · Reinforcement learning as a service

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 4
  • went through YCProgram · this site+4
  • team of 2Team size · YC's directory+2.5

A sum of public facts, not a judgement and not investment advice.

Competitors

Developer toolsVmaxShared: reinforcement learningSPC 2025San FranciscoStartup →Developer toolsPreference ModelShared: reinforcement learningSPC 2025San FranciscoStartup →AIOsmosisShared: reinforcement learning, reward, modelYC W25San FranciscoStartup →AICartpoleShared: reinforcement learning, modelYC X25San FranciscoStartup →AIAcquiredSymplexShared: reinforcement learningYC S19New York CityStartup →OtherPrime IntellectShared: reinforcement learning, agentStartup →
Companies closest to RunRL
Company
VmaxShared: reinforcement learningSPC 2025Not statedDevtools
Preference ModelShared: reinforcement learningSPC 2025Not statedDevtools
OsmosisShared: reinforcement learning, reward, modelYC W25ActiveAI, Devtools
CartpoleShared: reinforcement learning, modelYC X25ActiveAI, Data
SymplexShared: reinforcement learningYC S19AcquiredAI, Data
Prime Intellectnot in a program hereShared: reinforcement learning, agentElsewhereOther

Adjacent

OtherPhantasma LabsShared: reinforcement learningEF 2018BerlinStartup →OtherAgileRLShared: reinforcement learningEF 2023LondonStartup →AIUnsloth AIShared: reinforcement learning, model, llmsYC S24San FranciscoStartup →AITwolabsShared: reinforcement learning, model, selfYC X26San FranciscoStartup →AITrainLoopShared: reinforcement learningYC W25San FranciscoStartup →
Companies next to RunRL
Company
Phantasma LabsShared: reinforcement learningEF 2018Not statedOther
AgileRLShared: reinforcement learningEF 2023Not statedOther
Unsloth AIShared: reinforcement learning, model, llmsYC S24ActiveAI, Devtools
TwolabsShared: reinforcement learning, model, selfYC X26ActiveAI, Devtools
TrainLoopShared: reinforcement learningYC W25ActiveAI, Devtools

Also from X25 in AI

All of X25
AIAcoliteAI Native Commercial Insurance BrokerYC X25PhiladelphiaStartup →AIAdentrisReal-time AI Compliance & Revenue Integrity for Medical ProvidersYC X25San FranciscoStartup →AIAegisAI Agents to win denied health insurance claims.YC X25San FranciscoStartup →AIAirweaveThe open-source context retrieval layer for agentsYC X25San FranciscoStartup →AIAlkaliThe smarter way to estimate steel.YC X25HoustonStartup →AIAlmondAmerica's robot factoryYC X25San FranciscoStartup →
Company
AcoliteAI Native Commercial Insurance Brokerteam of 3ActiveAI
AdentrisReal-time AI Compliance & Revenue Integrity for Medical Providersteam of 5hiringActiveAI
AegisAI Agents to win denied health insurance claims.team of 3ActiveAI
AirweaveThe open-source context retrieval layer for agentsteam of 7hiringActiveAI, Devtools
AlkaliThe smarter way to estimate steel.team of 2hiringActiveAI, Devtools
AlmondAmerica's robot factoryteam of 6hiringActiveAI

Founders

  • Andrew GritsevskiyFounder

About RunRL

RunRL improves LLMs and AI agents with reinforcement learning. Do you have a model that needs to get better at a certain task? Are you tired of messing around with prompts? Do you spend a lot of money on observability, and wish that all this data could let your model self-improve? Well, head on over to RunRL.com, and see what we have to offer! If you give us a model, a prompt, and a reward, we’ll make your model’s reward go up.

YC batch
X25 · Spring 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
2
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

RunRL in X25: 144 companies, 90% AI

GitHub LinkedIn

RunRL: questions

Which YC batch was RunRL in?

RunRL was in Y Combinator's Spring 2025 batch (X25).

Is RunRL still active?

Y Combinator lists RunRL as active.

Who founded RunRL?

RunRL's founders, as listed on its YC page: Andrew Gritsevskiy (Founder).

Where is RunRL based?

RunRL lists San Francisco, CA, USA as its location on YC's directory.