The discussion is usually about opioids where the US is an outlier. For benzos I can't seem to find a good comparison, but this statistic stands out:

"In 2008, approximately 5.2% of US adults aged 18 to 80 years used benzodiazepines." [1]

Here "used" means filled at least one prescription during the year. This to me looks like an extremely high number, but I can't find a good number for comparable countries. I'd be very surpised if the rest of the OECD had a figure of even 1%

[1] https://www.researchgate.net/publication/269766767_Benzodiaz...