Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

CoArena

Active · The biggest crowdsourced benchmark for Computer-Use

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 7
  • went through YCProgram · this site+4
  • team of 2Team size · YC's directory+2.5

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

Competitors

AIDesign ArenaShared: crowdsourced benchmarkYC S25San FranciscoStartup →AIMusicArenaShared: crowdsourced benchmarkYC S26San FranciscoStartup →AIAcquiredSepal AIShared: data labeling, reinforcement learning, aiopsYC S24San FranciscoStartup →AIMarkovShared: data labeling, reinforcement learning, computerYC S26San FranciscoStartup →AIOoak DataShared: real work, reinforcement learning, agentYC S26San FranciscoStartup →
Companies closest to CoArena
Company
Design ArenaShared: crowdsourced benchmarkYC S25ActiveAI
MusicArenaShared: crowdsourced benchmarkYC S26ActiveAI
Sepal AIShared: data labeling, reinforcement learning, aiopsYC S24AcquiredAI, Data
MarkovShared: data labeling, reinforcement learning, computerYC S26ActiveAI, Data, Devtools
Ooak DataShared: real work, reinforcement learning, agentYC S26ActiveAI

Adjacent

AISherpa LabsShared: data labeling, reinforcement learningYC W25San FranciscoStartup →AIEpsilabShared: data labeling, reinforcement learning, machine learningYC F26San FranciscoStartup →AIKairosShared: reinforcement learning, aiops, machine learningYC X25San FranciscoStartup →AITraverseShared: reinforcement learning, machine learning, modelYC W26San FranciscoStartup →AICartpoleShared: data labeling, reinforcement learning, modelYC X25San FranciscoStartup →
Companies next to CoArena
Company
Sherpa LabsShared: data labeling, reinforcement learningYC W25ActiveAI, Data
EpsilabShared: data labeling, reinforcement learning, machine learningYC F26ActiveAI, Data
KairosShared: reinforcement learning, aiops, machine learningYC X25ActiveAI, Devtools
TraverseShared: reinforcement learning, machine learning, modelYC W26ActiveAI
CartpoleShared: data labeling, reinforcement learning, modelYC X25ActiveAI, Data

Also from S26 in AI

All of S26
AIAutoresearch, Inc.Autoresearch as a service: we solve your hardest measurable problemsYC S26San FranciscoStartup →AIDatoricThe training data R&D engine for physical AIYC S26San FranciscoStartup →AITokenlessWe find flaws in RL environments and evals and help you fix them.YC S26San FranciscoStartup →AIAgnost AIWe find where AI agents fail, then train better models to run them.YC S26San FranciscoStartup →AIBelvedirAutonomous AI Model TrainingYC S26San FranciscoStartup →AICueBenchRL post-training for science reasoning and performance engineeringYC S26San FranciscoStartup →
Company
Autoresearch, Inc.Autoresearch as a service: we solve your hardest measurable problemsteam of 3ActiveAI, Devtools
DatoricThe training data R&D engine for physical AIteam of 2ActiveAI, Data
TokenlessWe find flaws in RL environments and evals and help you fix them.team of 3ActiveAI, Devtools
Agnost AIWe find where AI agents fail, then train better models to run them.2 programsteam of 2ActiveAI, Data, Devtools
BelvedirAutonomous AI Model Trainingteam of 2ActiveAI
CueBenchRL post-training for science reasoning and performance engineeringteam of 3ActiveAI, Data

Founders

  • Prateek JannuFounder/CEO
  • Nitish KovuruFounder

About CoArena

CoArena is a live arena where anyone can use the world's top computer-use models racing two of them on the same real computer task and judging which one did it better. Every battle becomes something the AI labs can't build themselves, an honest test of their agents on real work, and the data to make them better.

YC batch
S26 · Summer 2026
Status, per YC
Active
Category
AI, Data, Developer tools
Team size
2
Location
San Francisco, CA, USA
Founded
2026
Checked
7h ago

YC tags: AIOps, Machine Learning, Reinforcement Learning, Data Labeling, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

CoArena in S26: 229 companies, 88% AI

LinkedIn

CoArena: questions

Which YC batch was CoArena in?

CoArena was in Y Combinator's Summer 2026 batch (S26).

Is CoArena still active?

Y Combinator lists CoArena as active.

Who founded CoArena?

CoArena's founders, as listed on its YC page: Prateek Jannu (Founder/CEO), Nitish Kovuru (Founder).

Where is CoArena based?

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