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Startups14,448Programs29

14,448 startups · 29 programs

Polymath

Active · Simulation environments for training & evaluating autonomous agents

WebsiteYC profile

Why it ranks

How the rank works
10signal of 100 · rising 10
  • team of 6Team size · YC's directory+4.4
  • went through YCProgram · this site+4
  • hiringHiring · Titles (titles.fru.dev), YC+2

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

Competitors

AIMangoDeskShared: long horizon, environmentYC S25San FranciscoStartup →AIBunkerhill HealthShared: horizon agent, long horizonYC W19San FranciscoStartup →AIEpsilabShared: long horizon, simulation, environmentYC F26San FranciscoStartup →AIWebhoundShared: long horizon, agentYC S23San FranciscoStartup →AIAviroShared: long horizon, train, environmentYC X25San FranciscoStartup →OtherPatronus AIShared: simulation environment, agentStartup →
Companies closest to Polymath
Company
MangoDeskShared: long horizon, environmentYC S25ActiveAI
Bunkerhill HealthShared: horizon agent, long horizonYC W19ActiveAI
EpsilabShared: long horizon, simulation, environmentYC F26ActiveAI, Data
WebhoundShared: long horizon, agentYC S23ActiveAI, Data
AviroShared: long horizon, train, environmentYC X25ActiveAI
Patronus AInot in a program hereShared: simulation environment, agentElsewhereOther

Adjacent

AIZibra LabsShared: horizon agent, long horizon, simulationYC X26San FranciscoStartup →AISterlingShared: long horizon, agent, labspeedrun SR007San FranciscoStartup →AIKlavis AIShared: long horizon, dataYC X25Startup →AISynthShared: long horizon, agentYC F24San FranciscoStartup →AIWorkers IOShared: simulation environment, agentYC F26San FranciscoStartup →
Companies next to Polymath
Company
Zibra LabsShared: horizon agent, long horizon, simulationYC X26ActiveAI, Devtools
SterlingShared: long horizon, agent, labspeedrun SR007Not statedAI
Klavis AIShared: long horizon, dataYC X25ActiveAI
SynthShared: long horizon, agentYC F24ActiveAI, Devtools
Workers IOShared: simulation environment, agentYC F26ActiveAI, Devtools

Also from W26 in AI

All of W26
AI/dev/fast/dev/fast is the AI-native code forgeYC W26San FranciscoStartup →AI10x ScienceThe AI-native platform for next-generation protein characterization.YC W26San FranciscoStartup →AI21stUI building blocks for the agentic internetYC W26San FranciscoStartup →AIAemonThe Forward-Deployed AI Research EngineerYC W26San FranciscoStartup →AIAgentic FabriqThe control plane for AI agents.YC W26San FranciscoStartup →AIAlt-XBuilding the best venue for private markets exposure.YC W26Los AngelesStartup →
Company
/dev/fast/dev/fast is the AI-native code forgeteam of 4ActiveAI, Devtools
10x ScienceThe AI-native platform for next-generation protein characterization.team of 5hiringActiveAI
21stUI building blocks for the agentic internetteam of 3ActiveAI, Devtools
AemonThe Forward-Deployed AI Research Engineerteam of 3hiringActiveAI, Devtools
Agentic FabriqThe control plane for AI agents.team of 2ActiveAI
Alt-XBuilding the best venue for private markets exposure.team of 2ActiveAI, Data

Founders

  • Dylan MaFounder/CEO
  • Naren YenugantiFounder/CTO

About Polymath

Polymath is a data lab focused on improving long-horizon agent capabilities and alignment. We build reinforcement learning environments for recursive self-improvement (RSI) and long-horizon software engineering.

YC batch
W26 · Winter 2026
Status, per YC
Active
Category
AI
Team size
6
Location
San Francisco, CA, USA
Founded
2026
Checked
6h ago

Changes seen

One-linerNov 9, 2026

Rewrote its one-liner; it read "Simulation environments to train & evaluate long-horizon AI agents"

Source ↗
StageOct 22, 2026

Stage changed from Early to Growth.

Source ↗

Polymath in W26: 199 companies, 81% AI

LinkedIn

Polymath: questions

Which YC batch was Polymath in?

Polymath was in Y Combinator's Winter 2026 batch (W26).

Is Polymath still active?

Y Combinator lists Polymath as active.

Who founded Polymath?

Polymath's founders, as listed on its YC page: Dylan Ma (Founder/CEO), Naren Yenuganti (Founder/CTO).

Where is Polymath based?

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