Okla. Stat. tit. 12, § 12-1106: Offer to confess judgment in part

After an action for the recovery of money is brought, the

defendant may offer in court to confess judgment for part of the

amount claimed, or part of the causes involved in the action;

whereupon, if the plaintiff, being present, refuse to accept such

confession of judgment in full of his demands against the defendant

in the action, or, having had such notice that the offer would be

made, of its amount, and of the time of making it, as the court

shall deem reasonable, fail to attend, and on the trial do not

recover more than was so offered to be confessed, such plaintiff

shall pay all the costs of the defendant incurred after the offer.

The offer shall not be deemed to be an admission of the cause of

action, or the amount to which the plaintiff is entitled, nor be

given in evidence upon the trial.