Cirrus Labs to join OpenAI shut down Circus CI on Monday, June 1, 2026
Cirrus Labs, known for its CI/CD and Apple Silicon virtualization tools, is joining OpenAI's Agent Infrastructure team. This acquisition aims to pivot their mission from cloud computing to the emerging field of agentic engineering, while also leading to the eventual shutdown of their flagship Cirrus CI product in 2026. The move highlights the growing influence of AI on development tooling and infrastructure.
The Lowdown
Fedor Korotkov, the founder of Cirrus Labs, has announced that the company will be joining OpenAI as part of its Agent Infrastructure team. Founded in 2017 with a 'Bell Labs' spirit, Cirrus Labs focused on building innovative tooling and environments to enhance engineer productivity in the cloud computing era, all without external funding.
- Over nine years, Cirrus Labs pioneered a SaaS CI/CD system supporting Linux, Windows, and macOS with bring-your-own-cloud capabilities, and developed Tart, a popular virtualization solution for Apple Silicon.
- The decision to join OpenAI stems from a recognition of the shift towards 'agentic engineering,' which is seen as the next frontier requiring new kinds of development tooling.
- At OpenAI, the team will continue its mission of creating effective tooling and environments, now for both human and 'agentic' engineers, operating closer to the cutting edge of engineering workflow definition.
- Regarding existing products, Cirrus Labs will relicense all source-available tools (including Tart, Vetu, and Orchard) under more permissive licenses and cease charging fees for them.
- New customers are no longer being accepted for Cirrus Runners, though existing contracts will be honored.
- Cirrus CI, the company's continuous integration platform, is scheduled to shut down on June 1, 2026.
Korotkov expressed profound gratitude to everyone who supported Cirrus Labs throughout its journey, calling the experience of building the company 'the privilege of a lifetime.'