What would you like to ask?how much would it cost to take a taxi from oakland to san jose?

It would probably be in the 3 figures-- too much. Call some of your local taxi services and ask. Renting a car would be alot cheaper. If you are going to the SJ airport, call some of the shuttle companies for availability and prices. Ppl don't realize that though many cities are considered part of the"bay area," the distances between these cities can be great.