Saudi oil diplomacy

I keep reading that the Saudis are helping us put pressure on Iran, notably through their refusal to cut back production as part of an OPEC plan to drive up prices. So why are CNN Money and the WSJ reporting that they are now doing exactly that? And why is outgoing Saudi ambassador to the U.S. Turki al-Faisal “dismiss[ing] speculation that Saudi Arabia was trying to drive down oil prices to constrain export revenues for political rival Iran”? Not that I’d be shocked to find a diplomat being coy about something so touchy when questioned, but doesn’t this step seem to suggest that he’s actually being straightforward and honest?