Okla. Stat. tit. 12, § 12-953
Final order defined
An order affecting a substantial right in an action, when such
order, in effect, determines the action and prevents a judgment, and
an order affecting a substantial right, made in a special proceeding
or upon a summary application in an action after judgment, is a
final order, which may be vacated, modified or reversed, as provided
in this article.
R.L. 1910, § 5237.