Independent AI buying guide
No paid rankings
Last checked 26 Oct 2026
Prices & plans
Every Lumo plan by Proton: what it costs, which AI models you get and whether the free plan is enough. Every price links to its source, and we re-check them every week.
The short answer
Lumo · 2 plans
Cheapest way in
Free
Yes. Lumo has a free plan. Paid plans start with Lumo Plus at $9.99/mo, billed yearly.
Is the free plan enough?
Mostly
Lumo Free covers the basics: it scores 90% of Lumo Plus for everyday use in the same independent tests.
Highest score
Plus
Lumo Plus scores 83/100 for everyday use, with GLM 5.3.
Prices per month, with the official source and the date we checked it. Scores are for everyday use, out of 100, from the same independent tests as our rankings.
| Plan | Price | Score | Worth it? |
|---|---|---|---|
| Free | FreeSource: Proton · verified 26 Oct 2026 | 75GLM 5.3 | — |
| Plus | $9.99/mo, billed yearlySource: Proton · verified 26 Oct 2026 | 83GLM 5.3 | Is it worth it? → |
The sourced facts per plan: price, AI models and what's included. Our opinion comes after.
Free plan
Paid plan
On every plan. Our take is opinion; strengths and limitations are sourced facts.
Our take (opinion, reviewed 9 Oct 2026)
Proton's privacy-first assistant from Switzerland, built on open-source models. Not as capable as the big names, but your chats stay private.
Good for
Not for
Prices are copied from each company's own pages, never estimated: a price we couldn't check says so. Scores come from independent benchmarks. Read how we rank, or see every AI plan side by side.