OpenAI buys Cirrus Labs
OpenAI reportedly acquired Cirrus Labs to bolster its agent infrastructure and plans to shut down Cirrus CI on June 1, according to aggregator reporting. The announcement frames the purchase as an integration play into CI/CD and workflow tooling rather than a standalone CI business. (simplenews.ai)
OpenAI is buying Cirrus Labs and plans to shut down Cirrus CI on June 1, 2026. (cirruslabs.org) Cirrus Labs said on April 7 that it had “entered into an agreement” to join OpenAI’s Agent Infrastructure team. The company said Cirrus CI will shut down effective Monday, June 1, 2026, and that it is no longer accepting new customers for Cirrus Runners. (cirruslabs.org) Cirrus CI is a continuous integration and continuous delivery service, the software that automatically builds and tests code before it ships. Cirrus says its platform supports Linux, Windows, macOS, and FreeBSD, and lets customers run jobs on cloud providers including Amazon Web Services, Google Cloud, Microsoft Azure, and Kubernetes. (cirrus-ci.org) Cirrus founder Fedor Korotkov said he started the company in 2017 and that it never raised outside capital. In the acquisition note, he said Cirrus built across “continuous integration, build tools, and virtualization” and called 2026 “the era of agentic engineering.” (cirruslabs.org) The deal fits OpenAI’s recent push deeper into developer infrastructure around Codex, its coding product. On March 19, OpenAI said it would acquire Astral to bring Python tools including uv, Ruff, and ty into the Codex ecosystem and help agents work across more of the software development lifecycle. (openai.com) OpenAI’s public newsroom also lists acquisitions of Promptfoo on March 9, Astral on March 19, and TBPN on April 2. That sequence puts Cirrus alongside a broader run of 2026 deals tied to software tooling rather than consumer apps. (openai.com) Cirrus said its source-available tools, including Tart, Vetu, and Orchard, will be relicensed under a more permissive license and licensing fees have already stopped. Tart is a virtualization tool for Apple Silicon Macs, and MacStadium said those tools are “heading toward open source” with no dedicated Cirrus team left behind them. (cirruslabs.org ) (macstadium.com) MacStadium, which sells a competing Mac infrastructure product, said teams using Cirrus CI need a replacement before June 1 and warned that future maintenance of Tart and Orchard will depend on outside contributors or users taking that work in-house. Cirrus itself said only that existing Cirrus Runners customers will be supported through their current contract periods. (macstadium.com) (cirruslabs.org) Unlike OpenAI’s Astral announcement, which said OpenAI planned to keep supporting Astral’s open-source products after closing, the Cirrus announcement centers on folding the team into Agent Infrastructure and winding down the hosted Cirrus CI business. For existing users, the immediate date that matters is June 1, 2026. (openai.com) (cirruslabs.org)
