This seems to be the best example yet I have heard of Ancient Greek being read . . . . First chapter of Xenophon's Anabasis.
Fascinating! I wonder how they figured out how it would have sounded?
No one is really sure, and the pronunciation was bound to have varied some, as it does in English, based on were someone is from . . . . . this example really though, sound very convincing, I think the person who did it is likely a native modern Greek speaker who has studied the ancient way of speaking, you can find more on his youtube channel.