Lumo: the least open 'open' AI we've seen

[... Lumo] is the least open "open" AI assistant that we have ever added to our index. One of our reasons for inclusion is an openness claim: a model provider that calls their system "open" or "open source" or a variation on that. Lumo is "open" in that sense (Proton calls it open source) but in no other way. Nothing about it is currently open. [...]