OpenProse
YC X26 · Active · An open-source operating system for reliable long-running agents
Competitors
| Company | Category | Status | Program |
|---|---|---|---|
 BentoLabs AIShared: running agent, long running, reliableActiveAI | AI | Active | YCX26 |
 CerulionShared: source operating, open source, reliableActiveAI, Devtools | AI, Devtools | Active | YCS24 |
 FormanceShared: source infrastructure, open source, building openActiveDevtools | Devtools | Active | YCS21 |
 Workflow86Shared: long running, agent workflow, systemActiveAI, Devtools | AI, Devtools | Active | YCW22 |
 DAGWorks Inc.Shared: open source, agent workflow, reliableAcquiredAI, Devtools | AI, Devtools | Acquired | YCW23 |
 Temporalnot in a program hereShared: reliable long, long running, open sourceElsewhereOther | Other | Elsewhere |
Adjacent
| Company | Category | Status | Program |
|---|---|---|---|
 General ReasoningShared: long running, agentNot statedAI | AI | Not stated | EF2025 |
 MentraShared: source operating, open source, systemActiveAI, Devtools | AI, Devtools | Active | YCW25 |
 Trigger.devShared: long running, open source, agentActiveAI, Devtools | AI, Devtools | Active | YCW23 |
 VocodeShared: open sourceAcquiredAI, Devtools | AI, Devtools | Acquired | YCW23 |
 BinpressShared: open sourceNot statedDevtools | Devtools | Not stated | 500 GlobalGA 6 |
Also from X26 in AI
All of X26| Company | Category | Status |
|---|---|---|
 AbInitio BioThe Intelligence layer for Drug ManufacturingActiveAI | AI | Active |
 Advanced Metal ResearchMachine intelligence for American WeldingActiveAI | AI | Active |
 AgentPhonePhone Numbers for AI AgentsActiveAI | AI | Active |
 AkkariAutonomous Customer OperationsActiveAI | AI | Active |
 AllowanceThe spend control layer for AI agentsActiveAI | AI | Active |
 AmborasAI Native ShopifyActiveAI, Data, Devtools | AI, Data, Devtools | Active |
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
- 32m ago
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.
Sources: each program's public company list, read twice a week. Not affiliated with Y Combinator or any other program. Logos via logo.dev; trademarks belong to their owners.