Lived on both the east coast and chicago... I expect it to be....
OKC is going to be a pretty crappy place to live without a ride and nothing is really close to each other. If I were you, I would look into a monthly rental car and make sure you get insured (probably through something other than the rental car company).
In reality, you’re going to need a car after OKC so you might want to just get one before you go.