YC Summer 2026 (S26) company

CoArena

The biggest crowdsourced benchmark for Computer-Use

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.

Public traction evidence

Each signal links to the public source used for attribution.

  1. X

    Introducing Co-Arena, a live arena for computer-use agents and the most advanced benchmark for CUA Six days in, 55,000+ steps and increasing every second.

    Introducing Co-Arena, a live arena for computer-use agents and the most advanced benchmark for CUA Six days in, 55,000+ steps and increasing every second. The leaderboard is live. Watch a battle. Judge one blind. Post your own task. Computer-use benchmarks are saturating....

  2. X

    Build something cool with Coasty.

    Build something cool with Coasty. Sign up today and get $100 in free API credits(Only this week). Build the coolest computer-use workflow you can think of, post it on X, and tag @coastyai. We'll repost! 🏆 The best submission wins $500 cash (wire transfer). Get started:...

  3. X

    Today, we're launching Coarena by Coasty, an arena for models to compete in computer-use.

    Today, we're launching Coarena by Coasty, an arena for models to compete in computer-use. Give Fable, Sol, gemini, etc, the same computer task and watch them battle, for free. You only find out who you voted for after you pick a winner. https://t.co/pUdae14WA0

  4. YouTube

    CoArena - The biggest crowdsourced benchmark for Computer Use

    CoArena - The biggest crowdsourced benchmark for Computer Use

  5. X

    We’re paying $500 for an open-source agent that eliminates a real business task using Coasty! To enter: • Solve a real business workflow(Minimum: 50 steps) • Publish the GitHub repo • Post a video showing it working • Tag @coastyai No toy demos.

    We’re paying $500 for an open-source agent that eliminates a real business task using Coasty! To enter: • Solve a real business workflow(Minimum: 50 steps) • Publish the GitHub repo • Post a video showing it working • Tag @coastyai No toy demos. We want workflows

  6. X

    GPT-5.6 Sol vs Claude Fable 5 for computer use.

    GPT-5.6 Sol vs Claude Fable 5 for computer use. Draw a forest on paint. Go and judge computer use battles at https://t.co/j06lDMvOt2

  7. X

    Today we are launching Coarena - The biggest crowdsourced benchmark for Computer-Use Computer-use benchmarks are saturating.

    Today we are launching Coarena - The biggest crowdsourced benchmark for Computer-Use Computer-use benchmarks are saturating. Static suites get published once, leak into training data, and scores climb while capability doesn't. An arena can't saturate. On CoArena, every

  8. X

    We're live on YC S26! Getting into YC was hard. Finding housing in SF? Somehow harder. The real demo day is Craigslist. coasty[dot]ai Nitish Kovuru

    We're live on YC S26! Getting into YC was hard. Finding housing in SF? Somehow harder. The real demo day is Craigslist. coasty[dot]ai Nitish Kovuru