Well if you want to think about it in depth then here is the explanation which all evidence thus far points to.
The Matrix is based upon "a harmony of mathematical precision" and equations. Therefore anything that you do in the Matrix has an effect, so from what it seems the equations and the chain reaction that follows is caused from choices in the brain before they even enter the Matrix.
Now if this is true (it is highly likely), then any equation which is started is predictable, right? This is so as any equation can be worked out and is ultimately predictable. Therefore the Oracle is seemingly programmed to automatically inherit the end result of any equation which has been started within the Matrix.
Now this explanation also explains as to why Neo now has the "Sight" as he knows the Matrix isn't real and as does his mind due to the Anomaly and his complete open-mindedness. Therefore any equation that he begins or anyone else for that matter, he should be able to predict etc.
That last paragraph basically says what Omega just said. Hope it helps a bit. I would type more but I am knackered.