export interface XaiModelPricing {
    inputPerMTok: number;
    outputPerMTok: number;
    cachedInputPerMTok?: number;
}
export declare const XAI_MODEL_PRICING: ReadonlyMap<string, XaiModelPricing>;
export declare function isGrokModelId(model: string): boolean;
export declare function deriveXaiCallCostUsd(model: string, inputTokens: number, outputTokens: number, cachedInputTokens?: number): number | undefined;