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14,448 startups · 29 programs

Cartpole

Active · Building reinforcement learning environments

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

AIAviroShared: learning environment, reinforcement learning, frontierYC X25San FranciscoStartup →AIMasterpieceShared: training frontier, learning environment, reinforcement learningYC X26New York CityStartup →AITensorTestShared: learning environment, reinforcement learning, data labelingYC W26San FranciscoStartup →AIDelightful AIShared: learning environment, reinforcement learning, trainingspeedrun SR007San FranciscoStartup →AIOsmosisShared: reinforcement learning, training, modelYC W25San FranciscoStartup →OtherPrime IntellectShared: reinforcement learningStartup →OtherSurge AIShared: reinforcement learning, environmentStartup →
Companies closest to Cartpole
Company
AviroShared: learning environment, reinforcement learning, frontierYC X25ActiveAI
MasterpieceShared: training frontier, learning environment, reinforcement learningYC X26ActiveAI
TensorTestShared: learning environment, reinforcement learning, data labelingYC W26ActiveAI, Data
Delightful AIShared: learning environment, reinforcement learning, trainingspeedrun SR007Not statedAI, Data
OsmosisShared: reinforcement learning, training, modelYC W25ActiveAI, Devtools
Prime Intellectnot in a program hereShared: reinforcement learningElsewhereOther
Surge AInot in a program hereShared: reinforcement learning, environmentElsewhereOther

Adjacent

Developer toolsPreference ModelShared: learning environment, reinforcement learningSPC 2025San FranciscoStartup →Developer toolsVmaxShared: reinforcement learningSPC 2025San FranciscoStartup →OtherPhantasma LabsShared: reinforcement learningEF 2018BerlinStartup →AIOsseusShared: learning environment, reinforcement learning, frontierYC S26LondonStartup →AIZavoShared: learning environment, reinforcement learning, frontierYC F25LondonStartup →
Companies next to Cartpole
Company
Preference ModelShared: learning environment, reinforcement learningSPC 2025Not statedDevtools
VmaxShared: reinforcement learningSPC 2025Not statedDevtools
Phantasma LabsShared: reinforcement learningEF 2018Not statedOther
OsseusShared: learning environment, reinforcement learning, frontierYC S26ActiveAI, Data
ZavoShared: learning environment, reinforcement learning, frontierYC F25ActiveAI, Data

Also from X25 in AI

All of X25
AIBesimple AIVoice data for AIYC X25San FranciscoStartup →AIFeynCustom models trained on your dataYC X25San FranciscoStartup →AIFreesoloProduct Native ModelsYC X25San FranciscoStartup →AIGodelaAI Physics Engine to replace simulations and prototypesYC X25San FranciscoStartup →AIKairosSpecialized AI for Critical IndustriesYC X25San FranciscoStartup →AISureformReal-world company data for frontier AIYC X25San FranciscoStartup →
Company
Besimple AIVoice data for AIteam of 8hiringActiveAI, Data
FeynCustom models trained on your datateam of 3ActiveAI, Devtools
FreesoloProduct Native Modelsteam of 4ActiveAI, Devtools
GodelaAI Physics Engine to replace simulations and prototypesteam of 10hiringActiveAI, Devtools
KairosSpecialized AI for Critical Industriesteam of 3ActiveAI, Devtools
SureformReal-world company data for frontier AIteam of 4ActiveAI, Data

Founders

  • Mateo PerezFounder/CEO

About Cartpole

We're creating reinforcement learning environments for training frontier models.

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

YC tags: Reinforcement Learning, Data Labeling, AI, ML

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Cartpole in X25: 144 companies, 90% AI

LinkedIn

Cartpole: questions

Which YC batch was Cartpole in?

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

Is Cartpole still active?

Y Combinator lists Cartpole as active.

Who founded Cartpole?

Cartpole's founders, as listed on its YC page: Mateo Perez (Founder/CEO).

Where is Cartpole based?

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