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Startups14,448Programs29

14,448 startups · 29 programs

Klavis AI

Active · RL environments and training data for frontier AI labs

WebsiteYC profile

Why it ranks

How the rank works
10signal of 100 · rising 7
  • team of 5Team size · YC's directory+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

AIDatacurveShared: quality coding, frontier, dataYC W24San FranciscoStartup →AIMangoDeskShared: long horizonYC S25San FranciscoStartup →AIWebhoundShared: long horizon, qualityYC S23San FranciscoStartup →AIEpsilabShared: long horizon, frontier, dataYC F26San FranciscoStartup →AIPolymathShared: long horizon, dataYC W26San FranciscoStartup →
Companies closest to Klavis AI
Company
DatacurveShared: quality coding, frontier, dataYC W24ActiveAI
MangoDeskShared: long horizonYC S25ActiveAI
WebhoundShared: long horizon, qualityYC S23ActiveAI, Data
EpsilabShared: long horizon, frontier, dataYC F26ActiveAI, Data
PolymathShared: long horizon, dataYC W26ActiveAI

Adjacent

OtherGridRasterShared: high quality, poweringAlchemist Class 18Mountain ViewStartup →AIAviroShared: long horizon, labs, frontierYC X25San FranciscoStartup →AIBunkerhill HealthShared: long horizonYC W19San FranciscoStartup →AIOperonShared: agentic dataYC S26San FranciscoStartup →AISynthShared: long horizon, codingYC F24San FranciscoStartup →
Companies next to Klavis AI
Company
GridRasterShared: high quality, poweringAlchemist Class 18Not statedOther
AviroShared: long horizon, labs, frontierYC X25ActiveAI
Bunkerhill HealthShared: long horizonYC W19ActiveAI
OperonShared: agentic dataYC S26ActiveAI, Devtools
SynthShared: long horizon, codingYC F24ActiveAI, 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

  • Xiangkai ZengFounder/CEO
  • Zihao LinFounder/CTO

About Klavis AI

Klavis AI builds RL environments and high-quality training data at scale for frontier AI labs.

YC batch
X25 · Spring 2025
Status, per YC
Active
Category
AI
Team size
5
Founded
2025
Checked
7h ago

Changes seen

Team sizeNov 9, 2026

Team went from 3 to 5 people.

Source ↗
One-linerNov 9, 2026

Rewrote its one-liner; it read "High Quality Coding & Agentic Data for AI labs"

Source ↗

Klavis AI in X25: 144 companies, 90% AI

LinkedIn

Klavis AI: questions

Which YC batch was Klavis AI in?

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

Is Klavis AI still active?

Y Combinator lists Klavis AI as active.

Who founded Klavis AI?

Klavis AI's founders, as listed on its YC page: Xiangkai Zeng (Founder/CEO), Zihao Lin (Founder/CTO).