Very effective at translating between different (human) languages. Best if you can find a native speaker to double-check the output. Failing that, reverse translate with a couple different models to verify the meaning is preserved. Even this sometimes fails though – e.g. two words with similar but subtly different definitions might trip you up. For instance, I’m told “the west” refers to different regions in english and japanese, but translating and reverse translating didn’t reveal this error.