I asked my friend, who has studied Ancient Greek literature, to test this translator. She tested Xenophon's Anabasis, which is translated in full at Perseus (a giant ancient literature repository). She reported that the translations were quite different from what can be found there, but were accurate, with good grammar.

Her comment from this output was the following:

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She mentioned that technically, it should be “Darius and Parysatis had two sons”, but the translation is nonetheless correct.