Cirrus Labs to join OpenAI
The team behind popular Apple Silicon virtualization tool Tart is joining OpenAI's Agent Infrastructure team.
Cirrus Labs, the independent engineering tools company founded by Fedor Korotkov in 2017, announced on April 7, 2026 that it will join OpenAI as part of their Agent Infrastructure team. The company, which operated for nine years without outside funding, built several notable products including Tart—the most popular virtualization solution for Apple Silicon—and pioneered a SaaS CI/CD system supporting Linux, Windows, and macOS with bring-your-own-cloud capabilities. Korotkov stated the move aligns with their original mission of building tooling to make engineers more productive, now extending that focus to "agentic engineers" in the AI era.
As part of the transition, Cirrus Labs will relicense all its source-available tools (Tart, Vetu, and Orchard) under more permissive licenses and stop charging licensing fees. The company will no longer accept new customers for Cirrus Runners but will support existing customers through their contract periods. Cirrus CI will officially shut down on June 1, 2026. The acquisition represents OpenAI's continued investment in infrastructure for AI agents—autonomous systems that can execute tasks—as the company builds tools for the next generation of engineering workflows.
- Cirrus Labs built Tart, the most popular virtualization solution for Apple Silicon, used by developers worldwide
- The company pioneered multi-platform CI/CD in 2018 with support for Linux, Windows, and macOS on bring-your-own-cloud infrastructure
- All existing tools (Tart, Vetu, Orchard) will become open source with permissive licensing, while Cirrus CI shuts down June 1, 2026
Why It Matters
OpenAI gains critical infrastructure expertise for building tools that help AI agents execute tasks autonomously, accelerating development of practical AI applications.