I could find only 1 account of someone who has taken the OPI for Japanese and I am currently interested in these types of tests to do in addition to the JLPT.
For those unfamiliar with OPI it means "Oral Proficiency Interview" which lasts around 20~40 minutes according to their official website.
Since the JLPT does not test oral proficiency I've been looking into various other tests that would include and/or focus on spoken Japanese.