Okla. Stat. tit. 58, § 58-66: Costs of contest

The fees and expenses must be paid by the party contesting the

validity or probate of the will, if the will in probate be

confirmed. If the probate be annulled and revoked, the costs must be

paid by the party who resisted the revocation, or out of the

property of the decedent, as the court directs.