YOU SAID:

Siri is not as smart as Cortana

INTO JAPANESE

シリは Cortana としてスマートではないです。

BACK INTO ENGLISH

Siri is as smart as Cortana is not.

INTO JAPANESE

シリは、Cortana はスマートです。

BACK INTO ENGLISH

Siri, Cortana is smart.

INTO JAPANESE

シリ、Cortana はスマートです。

BACK INTO ENGLISH

Siri, Cortana is smart.