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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Cirrus Labs to join OpenAI</title>
<meta
name="description"
content="Cirrus Labs announces an agreement to join OpenAI as part of the Agent Infrastructure team."
>
<meta name="theme-color" content="#212121">
<meta property="og:type" content="website">
<meta property="og:title" content="Cirrus Labs to join OpenAI">
<meta
property="og:description"
content="Cirrus Labs announces an agreement to join OpenAI as part of the Agent Infrastructure team."
>
<meta property="og:image" content="https://cirruslabs.org/assets/cirruslabs-bright-with-bg.png">
<meta property="og:url" content="https://cirruslabs.org/">
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name="twitter:description"
content="Cirrus Labs announces an agreement to join OpenAI as part of the Agent Infrastructure team."
>
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rel="stylesheet"
>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="page-shell">
<header class="site-header">
<a class="brand" href="/" aria-label="Cirrus Labs home">
<img src="assets/cirruslabs-bright.png" alt="Cirrus Labs">
</a>
</header>
<main class="page-content">
<article class="announcement">
<p class="eyebrow">Official announcement</p>
<time class="post-date" datetime="2026-04-07">April 7th, 2026</time>
<h1>Cirrus Labs to join OpenAI</h1>
<address class="author-card">
<img
class="author-avatar"
src="https://github.com/fkorotkov.png"
alt="Fedor Korotkov"
width="72"
height="72"
>
<div class="author-copy">
<p class="author-name">Fedor Korotkov</p>
<a class="author-link" href="https://x.com/fedor" target="_blank" rel="noreferrer">
@fedor
</a>
</div>
</address>
<div class="article-body">
<p class="lead">
I started Cirrus Labs in 2017 in the spirit of Bell Labs. I wanted to work on fun
and challenging engineering problems, in the hope of bootstrapping a business as a
byproduct.
</p>
<p>
The mission was to help fellow engineers with new kinds of tooling and environments
that would make them more efficient and productive in the era of cloud computing.
Even the name reflected that ambition: Cirrus, inspired by cirrus clouds, one of the
highest clouds in the sky.
</p>
<p>
We never raised outside capital. That let us stay patient, stay close to the
problems, and put a great deal of care into the products we built.
</p>
<p>
Over the last nine years, we were fortunate to innovate across continuous
integration, build tools, and virtualization. In 2018, we introduced what we
believe was the first SaaS CI/CD system to support Linux, Windows, and macOS while
allowing teams to bring their own cloud. In 2022, we built <a
href="https://github.com/cirruslabs/tart"
target="_blank"
rel="noreferrer"
>Tart</a>, which became the most popular virtualization solution for Apple Silicon,
along with several other tools along the way.
</p>
<p>
In 2026, it is impossible to ignore the era of agentic engineering, just as it was
impossible to ignore cloud computing in 2017. Agents need new kinds of tooling and
environments to be efficient and productive as well.
</p>
<p>
This is why when the opportunity arose for us to join OpenAI, it was an easy yes,
and I'm happy to announce today that we've entered into an agreement to join OpenAI
as part of the Agent Infrastructure team.
</p>
<p>
Joining OpenAI allows us to extend the mission we started with Cirrus Labs: building
new kinds of tooling and environments that make engineers more effective, for both
human engineers and agentic engineers. It also gives us the opportunity to innovate
closer to the frontier, where the next generation of engineering workflows is being
defined.
</p>
<h2>What's next for our existing products?</h2>
<div class="status-panel">
<p>
In the coming weeks, we will relicense all of our source-available tools,
including <a
href="https://github.com/cirruslabs/tart"
target="_blank"
rel="noreferrer"
>Tart</a>, <a
href="https://github.com/cirruslabs/vetu"
target="_blank"
rel="noreferrer"
>Vetu</a> and <a
href="https://github.com/cirruslabs/orchard"
target="_blank"
rel="noreferrer"
>Orchard</a> under a more permissive license. We have also stopped charging
licensing fees for them.
</p>
<p>
We are no longer accepting new customers for Cirrus Runners but will continue
supporting the service for existing customers through their existing contract
periods.
</p>
<p>
<a
href="https://github.com/cirruslabs/cirrus-ci-docs"
target="_blank"
rel="noreferrer"
>Cirrus CI</a> will shut down effective Monday, June 1, 2026.
</p>
</div>
<p>
To everyone who used our products, contributed code, reported bugs, trusted us with
their workflows, or supported us along the way: thank you. Building Cirrus Labs has
been the privilege of a lifetime.
</p>
</div>
</article>
</main>
</div>
</body>
</html>