At Noble the bonuses the AI gets over the human player are:
1)Pay 50% unit upgrade cost.
2)Pay 50% unit supply costs (that's the cost of having a unit outside your borders, not the cost of maintaining it - they pay the same as the human there)
3)They only get 80% of the inflation rate.
4)They only get 80% war weariness
5)While both humans and AI get a bonus against barbarians, the AI gets a 15% higher bonus.
6)There is a concealed -1 to relations between humans and AI.
7)The AI gets 10 free hammers in its capital at the start.
I think that's the lot. There's nothing like free units or free tech at this level.