OpenAI just picked up Cirrus Labs. Nine years, no outside funding, one popular virtualization tool for Apple Silicon. Founded by Fedor Korotkov in 2017, the company built CI/CD and cloud computing tooling without ever raising venture capital. Now the whole team joins OpenAI's Agent Infrastructure group.
Why does OpenAI want a CI company? Because agents that write code need places to safely run it, often in a containerized workspace. Tools like Tart create isolated sandboxes with resource limits and snapshots for state resets. That's exactly what you need when an AI is executing code autonomously. OpenAI isn't just competing on model quality anymore. They're building the full stack that lets agents actually do work.
For customers, the news comes with a hard deadline. Cirrus CI shuts down on June 1, 2026. No new customers for Cirrus Runners, though existing contracts will be honored. Tart, Vetu, and Orchard are all moving to more permissive licenses. Licensing fees have already stopped.
Anthropic is pushing hard on computer use. Startups like Devin and Factory are building agent-specific CI tools from scratch. But OpenAI buying a mature virtualization company gives them working infrastructure now, not later. Korotkov framed the move as extending Cirrus Labs' mission from human engineers to what he called "agentic engineers."
Some Hacker News users grumbled about the timeline. Fourteen months notice, and some teams have built serious infrastructure around Cirrus CI. Fair complaint. Migration is painful. But the bigger story is where talent and money are flowing. Companies with deep infrastructure expertise are being pulled into the AI agent ecosystem. OpenAI isn't just building models. It's building the runtime.