Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

OpenProse

Active · An open-source operating system for reliable long-running agents

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 7
  • went through YCProgram · this site+4
  • team of 3Team size · YC's directory+3.1

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

Competitors

AIBentoLabs AIShared: running agent, long running, reliableYC X26BengaluruStartup →AIAcyclic LabsShared: running agent, long running, openYC F26LondonStartup →AIWorkflow86Shared: agent workflow, long running, languageYC W22San FranciscoStartup →Developer toolsFormanceShared: source infrastructure, building openYC S21ParisStartup →AICerulionShared: source operating, reliable, openYC S24San FranciscoStartup →OtherTemporalShared: reliable long, long running, openStartup →OtherSkyPilotShared: running, open, sourceStartup →
Companies closest to OpenProse
Company
BentoLabs AIShared: running agent, long running, reliableYC X26ActiveAI
Acyclic LabsShared: running agent, long running, openYC F26ActiveAI, Devtools
Workflow86Shared: agent workflow, long running, languageYC W22ActiveAI, Devtools
FormanceShared: source infrastructure, building openYC S21ActiveDevtools
CerulionShared: source operating, reliable, openYC S24ActiveAI, Devtools
Temporalnot in a program hereShared: reliable long, long running, openElsewhereOther
SkyPilotnot in a program hereShared: running, open, sourceElsewhereOther

Adjacent

AIGeneral ReasoningShared: long running, agentEF 2025ExternalStartup →AIAcquiredMetisShared: reliable agent, infrastructureYC S25San FranciscoStartup →AIRandom LabsShared: long running, agent, workYC S24San FranciscoStartup →AIDecohereShared: long running, infrastructure, buildingYC W23SeattleStartup →AITrigger.devShared: long running, open, sourceYC W23LondonStartup →
Companies next to OpenProse
Company
General ReasoningShared: long running, agentEF 2025Not statedAI
MetisShared: reliable agent, infrastructureYC S25AcquiredAI
Random LabsShared: long running, agent, workYC S24ActiveAI, Devtools
DecohereShared: long running, infrastructure, buildingYC W23ActiveAI
Trigger.devShared: long running, open, sourceYC W23ActiveAI, Devtools

Also from X26 in AI

All of X26
AIAbInitio BioThe Intelligence layer for Drug ManufacturingYC X26BostonStartup →AIAdvanced Metal ResearchMachine intelligence for American WeldingYC X26Los AngelesStartup →AIAgentPhonePhone Numbers for AI AgentsYC X26San FranciscoStartup →AIAGI Deploy CoDiffusing AI into critical industriesYC X26San FranciscoStartup →AIAkkariAutonomous Customer OperationsYC X26San FranciscoStartup →AIAlchemizeBuilding AI Native Customs BrokeragesYC X26San FranciscoStartup →
Company
AbInitio BioThe Intelligence layer for Drug Manufacturingteam of 2ActiveAI
Advanced Metal ResearchMachine intelligence for American Weldingteam of 3ActiveAI
AgentPhonePhone Numbers for AI AgentshiringActiveAI
AGI Deploy CoDiffusing AI into critical industriesteam of 2ActiveAI
AkkariAutonomous Customer Operationsteam of 5ActiveAI
AlchemizeBuilding AI Native Customs Brokeragesteam of 2ActiveAI

Founders

  • Dan BarrettFounder/CEO

About OpenProse

OpenProse is building open-source infrastructure for long-running AI work: a declarative language plus a reactive harness/runtime for reliable agent workflows.

YC batch
X26 · Spring 2026
Status, per YC
Active
Category
AI, Developer tools
Team size
3
Location
Boston, MA, USA; Remote
Founded
2026
Checked
6h ago

OpenProse in X26: 194 companies, 84% AI

LinkedIn

OpenProse: questions

Which YC batch was OpenProse in?

OpenProse was in Y Combinator's Spring 2026 batch (X26).

Is OpenProse still active?

Y Combinator lists OpenProse as active.

Who founded OpenProse?

OpenProse's founders, as listed on its YC page: Dan Barrett (Founder/CEO).

Where is OpenProse based?

OpenProse lists Boston, MA, USA; Remote as its location on YC's directory.