> Lumo’s code is open source, meaning anyone can see it’s secure and does what it claims to.

No link to source code in the article. GitHub search also doesn’t show any source code for Lumo.

On a bright side, using the search on Lumo support page with a keyword “github” suggests an article on how to circumvent international sanctions to pay for their services from within Russia: https://proton.me/support/pay-russia

Please don't misrepresent this page. It's not instructions on how to circumvent sanctions, it tells how to pay for Proton services in situations where most payment methods are unavailable due to sanctions on financial institutions. Not everyone in Russia is under sanctions (yet).

I asked Lumo:

> Is Lumo open source?

>> I'm not sure if Lumo is open source. Let me check the official information about Lumo to confirm this.

>> Based on the information provided in the Lumo FAQ, Lumo is not open source. The models powering Lumo are open-source large language models (LLMs) that have been optimized by Proton, but Lumo itself is a proprietary product developed by Proton.

I think this is a bit of an accidentally correct confabulation - I can't find that in any Lumo faq - but it seems consistent with Proton overall; afaik they don't open source any server side/service code?

"Open source" requires actual published source code with an OSI-approved license, not just a marketing claim - without a repository link, this appears to be openwashing.

I think they must have nuked that claim, because the current blog post doesn't say it, only speaking to their use of "open-source language models"

Definitely underhanded of them to just update it in-place, without an edit note

It seems the Wayback machine didn't get to it in time, as the snapshot also doesn't cite it