I’m happy for the founders, they’re great folks. I contributed to CirrusCI a bit in the past and it was a great experience. I even advocated for Cirrus in a couple of my last $DAYJOBs (with varied success). Congrats Fedor!
I’m very sad they’re shutting down, though. IMHO CirrusCI was very close to a perfect CI system (I wrote a blogpost about it [0]). I’ll now have to find something to replace it with in my personal projects. I guess I’ll run their cirrus-cli in GitHub Actions for a while. But GitHub Actions is really poor. I heard some good things about Buildkite.
Note that this is fundamentally different from the Astral acquisition. At the end of their announcement, they stated:
> Cirrus CI will shut down effective Monday, June 1, 2026.
And earlier in the article:
> 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 isn't a product-led acquisition, but more a talent one.
Just want to note that we will continue maintaining and improving our virtualization solutions actually with even greater attention. SaaS options like Cirrus CI and Cirrus Runners will eventually wind down so we can focus on incorporating pieces internally.
Yeah. Much like Astral - acquiring both the product (because they need to use it internally, but don't care about trying to resell / market), and they also want the talent to keep maintaining it / add features they want.
Same; the reason everyone ran out to buy Mac Minis last month is it gave their Claw access to iMessage, their browser cookies, and a residential IP. Cirrus provides a way to provision and orchestrate MacOS VMs, which is exactly what I did for running Openclaw (for a minute …).
Cirrus gave a ton of support for years to open source projects. I congratulate them on cashing out. Running a business like Cirrus did is always a hard road and I will never fault folks who gave time and resources on their platform away for taking the money.
I wish Fedor and everyone at Cirrus the best of luck and OpenAI and thank them immensely for the years of free CI they gave to us in the Pony programming language despite it not having any marketing value to them.
The level of aqui-hires is getting interesting - at this point, it appears that if one wants one's career to progress, you need to start some kind of tiny startup like Astral or Bun and hope to be notable enough you can get acquired by someone like OpenAI or Anthropic.
It certainly makes the idea of a career progression / promotion more challenging than it used to be, but perhaps it also opens up some new opportunities. It becomes far more "high stakes" since you have to take the risk of starting and running a startup that ultimately fails if it does not get acqui-hired.
It’s been true for a while, but AI seems to have exaggerated it. To me it reinforces the idea that LLMs created a “K” shaped talent market. Those whose are good become even more valuable.
I think “tiny startup” is too underselling Astral. At least to me they have a game changing product, or in the start up dream: make the (Python) world a better place
Wow Cirrus was like the one cool CI thing with first-class Podman support. RIP. Guess I'm looking elsewhere (and not at Dagger which refuses to support rootless Podman).
A pity. Cirrus has been providing quite decent CI facilities, for free. One of the advantages (among many) compared to GitHub Actions is the large variety of runner images, e.g., Debian, Fedora, Alpine, FreeBSD, ...
> We are no longer accepting new customers for Cirrus Runners but will continue supporting the service for existing customers through their existing contract periods.
To create an ephemeral (docker-like) MacOS VM on a Mac with full performance and access (e.g. GPU) you have to use a virtualization API provided by Apple.
You can use:
Anka, a "contact-us for pricing" closed-source projet, where you have to pay expensive license (easy 3000 USD/yr per machine)
or
tart, which is a lightweight wrapper around the official Apple API.
But you have to know that on MacOS, there is an artificial limit of 2 VMs per Mac... but well:
I just love how companies like this gaslight the whole world with announcements like this.
We started a company to make a big difference in the world and build an engineer’s dream company, and that’s why we have now decided to do the exact opposite and become employee numbers 32,463 through 32,510 at one of the largest tech companies in the world because money is nice.
Look, I’d have done the same thing, I’m not criticizing the choice. I just think we don’t need this kind of weird unnatural rhetoric.
Please just stop with the tech industry puffery. You’re not Steve Jobs, you’re just the DevOps team at OpenAI now. You’re dumping your worthless code on GitHub, and you’re kicking your customers to the curb.
There’s no PR spin left to do anymore. You’re not a company anymore and you’re not a founder anymore.
I just don't think there's much upside to telling it how it is in the press release that gets buried after a week and everyone moves on. For better or worse.
Wow, this is surprising.
I’m happy for the founders, they’re great folks. I contributed to CirrusCI a bit in the past and it was a great experience. I even advocated for Cirrus in a couple of my last $DAYJOBs (with varied success). Congrats Fedor!
I’m very sad they’re shutting down, though. IMHO CirrusCI was very close to a perfect CI system (I wrote a blogpost about it [0]). I’ll now have to find something to replace it with in my personal projects. I guess I’ll run their cirrus-cli in GitHub Actions for a while. But GitHub Actions is really poor. I heard some good things about Buildkite.
[0]: https://garden.pacia.tech/cirrus_ci_is_the_best.html
Note that this is fundamentally different from the Astral acquisition. At the end of their announcement, they stated:
> Cirrus CI will shut down effective Monday, June 1, 2026.
And earlier in the article:
> 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 isn't a product-led acquisition, but more a talent one.
Just want to note that we will continue maintaining and improving our virtualization solutions actually with even greater attention. SaaS options like Cirrus CI and Cirrus Runners will eventually wind down so we can focus on incorporating pieces internally.
It could also be a suite of product acquisition, the CI could be a product OpenAI is interested in having, but not sell.
Yeah. Much like Astral - acquiring both the product (because they need to use it internally, but don't care about trying to resell / market), and they also want the talent to keep maintaining it / add features they want.
This does raise some concerns in major open-source projects:
https://github.com/scipy/scipy/issues/24990
https://www.postgresql.org/message-id/3ydjipcr7kbss57nvi67no...
FTA:
> In 2022, we built Tart, which became the most popular virtualization solution for Apple Silicon, along with several other tools along the way.
from Tart's github:
> [Tart is for] macOS and Linux VMs on Apple Silicon to use in CI and other automations
My (naive?) hypothesis is this kind of expertise is why OpenAI chose to acquihire.
Same; the reason everyone ran out to buy Mac Minis last month is it gave their Claw access to iMessage, their browser cookies, and a residential IP. Cirrus provides a way to provision and orchestrate MacOS VMs, which is exactly what I did for running Openclaw (for a minute …).
I liked “our incredible journey” more when it wasn’t rushing headlong into OpenMawAI
Cirrus gave a ton of support for years to open source projects. I congratulate them on cashing out. Running a business like Cirrus did is always a hard road and I will never fault folks who gave time and resources on their platform away for taking the money.
I wish Fedor and everyone at Cirrus the best of luck and OpenAI and thank them immensely for the years of free CI they gave to us in the Pony programming language despite it not having any marketing value to them.
I've moved most companies away from using others stuff
Today we use Hertzner and OVH and roll out our own solution whenever possible.
Running lean and mean.
Depending on such third party services is a trap.
What software do you use to run your CI?
The level of aqui-hires is getting interesting - at this point, it appears that if one wants one's career to progress, you need to start some kind of tiny startup like Astral or Bun and hope to be notable enough you can get acquired by someone like OpenAI or Anthropic.
It certainly makes the idea of a career progression / promotion more challenging than it used to be, but perhaps it also opens up some new opportunities. It becomes far more "high stakes" since you have to take the risk of starting and running a startup that ultimately fails if it does not get acqui-hired.
It’s been true for a while, but AI seems to have exaggerated it. To me it reinforces the idea that LLMs created a “K” shaped talent market. Those whose are good become even more valuable.
I think “tiny startup” is too underselling Astral. At least to me they have a game changing product, or in the start up dream: make the (Python) world a better place
Wow Cirrus was like the one cool CI thing with first-class Podman support. RIP. Guess I'm looking elsewhere (and not at Dagger which refuses to support rootless Podman).
Thank you! Cirrus CLI is still around and can run your tasks locally in either Podman or Docker. Can also be used in any other CI.
A pity. Cirrus has been providing quite decent CI facilities, for free. One of the advantages (among many) compared to GitHub Actions is the large variety of runner images, e.g., Debian, Fedora, Alpine, FreeBSD, ...
Am I reading this right?: a CI company that shuts down CI services with such short notice?
Do service providers not think customers have other things to do than simply maintain their existing infrastructure?
Cirrus CI was on a downhill in terms of users and revenue for years now. Most of the customers moved to GHA already.
Plus migration is super easy with Cirrus CLI -- tool to run our CI task definitions locally or in any CI. See https://github.com/cirruslabs/cirrus-cli
Realistically this is what you agree to when you want to use someone else's computer. They can just as easily ran out of money.
but they're not
> We are no longer accepting new customers for Cirrus Runners but will continue supporting the service for existing customers through their existing contract periods.
I don’t think they care about their customers at all, from the statement they consider their business a “byproduct”.
Same thoughts. Guess the migration team responsible will have to kick up the gear.
> I wanted to work on fun and challenging engineering problems, in the hope of bootstrapping a business as a byproduct.
> We never raised outside capital
I guess it worked out though
What was the USP of their CI service?
To create an ephemeral (docker-like) MacOS VM on a Mac with full performance and access (e.g. GPU) you have to use a virtualization API provided by Apple.
You can use:
or But you have to know that on MacOS, there is an artificial limit of 2 VMs per Mac... but well:https://github.com/cirruslabs/orchard/commit/3cfa2445500f45f...
With https://khronokernel.com/macos/2023/08/08/AS-VM.html
Some people might find it very attractive:
Ability to virtualize on Apple devices and linux with GPUs https://github.com/scipy/scipy/issues/24990
Wow. I have rarely seen a company website with so many buzzwords. Still not sure what they do, except "AI". Good riddance
Another one bites the dust.
I just love how companies like this gaslight the whole world with announcements like this.
We started a company to make a big difference in the world and build an engineer’s dream company, and that’s why we have now decided to do the exact opposite and become employee numbers 32,463 through 32,510 at one of the largest tech companies in the world because money is nice.
Look, I’d have done the same thing, I’m not criticizing the choice. I just think we don’t need this kind of weird unnatural rhetoric.
Please just stop with the tech industry puffery. You’re not Steve Jobs, you’re just the DevOps team at OpenAI now. You’re dumping your worthless code on GitHub, and you’re kicking your customers to the curb.
There’s no PR spin left to do anymore. You’re not a company anymore and you’re not a founder anymore.
Making a statement like this is generally part of the terms of the acquisition.
Sure, but I imagine the terms of the acquisition doesn’t say you have to write it in this specific style.
I’m sure there’s a way to say the same thing without coming across as a bullshitter.
I just don't think there's much upside to telling it how it is in the press release that gets buried after a week and everyone moves on. For better or worse.
More like employees number 32,463 and 32,464 - they’re two people from what I seen on GitHub over the years. (Incredibly strong two people)
yea yea yea, purchase every last company you find, no one wants OpenAI