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14,448 startups · 29 programs

Cosine

Active · Fully Agentic SWE

WebsiteYC profile

Why it ranks

How the rank works
12signal of 100 · rising 4
  • team of 12Team size · YC's directory+5.8
  • 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.

Same space

AIvoizeShared: nlp, machine learning, workYC W22BerlinStartup →AIAcquiredHomeRoomShared: nlp, machine learning, workYC W22San FranciscoStartup →AIAskUIShared: agenticSeedcamp 2023Startup →AICompose.aiShared: nlp, workYC W21CarlsbadStartup →AIMinusXShared: machine learning, agentic, workYC S24San FranciscoStartup →
Companies next to Cosine
Company
voizeShared: nlp, machine learning, workYC W22ActiveAI
HomeRoomShared: nlp, machine learning, workYC W22AcquiredAI, Data
AskUIShared: agenticSeedcamp 2023Not statedAI
Compose.aiShared: nlp, workYC W21ActiveAI
MinusXShared: machine learning, agentic, workYC S24ActiveAI, Data

Also from W23 in AI

All of W23
AIBoundaryThe programming language for AIYC W23SeattleStartup →AIDataSuiteDataset Management for AI TrainersYC W23New York CityStartup →AI1stCollabPerformance-Optimized Influencer Marketing at ScaleYC W23San FranciscoStartup →AI222the AI social facilitator for offline human to human interactionsYC W23New York CityStartup →AIAqueductCreate, edit, and share procedural material graphs.YC W23PittsburghStartup →AIAtmetoBuilding a frontier world model for powerYC W23Los AngelesStartup →
Company
BoundaryThe programming language for AIteam of 10hiringActiveAI, Devtools
DataSuiteDataset Management for AI Trainersteam of 4ActiveAI, Devtools
1stCollabPerformance-Optimized Influencer Marketing at Scaleteam of 11hiringActiveAI
222the AI social facilitator for offline human to human interactionsteam of 28hiringActiveAI
AqueductCreate, edit, and share procedural material graphs.ActiveAI, Devtools
AtmetoBuilding a frontier world model for powerteam of 2ActiveAI

About Cosine

Cosine is a fully agentic SWE that allows you to instantly work on every single ticket at once, asynchronously.

YC batch
W23 · Winter 2023
Status, per YC
Active
Category
AI, Developer tools
Team size
12
Location
London, England, United Kingdom
Checked
6h ago

YC tags: Developer Tools, Generative AI, Machine Learning, NLP, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

Cosine in W23: 274 companies, 69% AI

Cosine: questions

Which YC batch was Cosine in?

Cosine was in Y Combinator's Winter 2023 batch (W23).

Is Cosine still active?

Y Combinator lists Cosine as active.

Where is Cosine based?

Cosine lists London, England, United Kingdom as its location on YC's directory.