The Leica M10 Monochrom is the company’s third mono-only rangefinder. It uses an entirely new 40MP sensor, rather than borrowing the 24MP chip from the other M10 models.

We think the Bayer filter array is an amazing creation, producing results that massively outweigh its drawbacks, but there are a few reasons why going without color filters is more than just a gimmick.
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https://www.dpreview.com/articles/2062427975/why-leica-s-m10-monochrom-is-more-than-just-a-gimmick