I would try to make comparison with Google's CLD tomorrow
Bearing in mind that fastText supports many more languages than CLD.
depends on the mode, but I've compared with only ~60 languages
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Why is it just 93% accurate on Wikipedia? Is it that hard to identify languages?
I suspect it's due to mixed-language content on Wikipedia. A lot of Wikipedia articles talk about foreign language art and culture, this is one of the largest (if not the largest) single categories of content on non-English Wikipedias.