/**
 * Turn a provider's reported token counts into dollars.
 *
 * Rates come from docs/realtime-providers.md, which quotes the vendor pricing
 * pages verbatim (checked 2026-08-06).
 */
import type { RealtimeUsage } from "../../shared/voice.js";
/** Stands in for the model when `realtime.model` is unset: the provider picks,
 *  so the gateway cannot name the model and therefore cannot price it. */
export declare const UNPINNED_MODEL = "provider-default";
export interface TurnPrice {
    costUsd: number;
    /** False when the model is absent from the rate table. The caller surfaces the
     *  flag rather than a $0.00 that reads like a free turn. */
    pricingKnown: boolean;
}
/** Price one turn's usage. `usage` is the delta for that turn, not a
 *  session-to-date total — the caller subtracts before it gets here. */
export declare function priceTurn(model: string, usage: RealtimeUsage): TurnPrice;
/** Which modality bills an unattributed cached token highest on this model. Not
 *  the dearer of the two cached rates: a cached token also cancels the full input
 *  rate it would otherwise have been charged at, so what a modality bills for it
 *  is the cached rate less that discount. On `gpt-realtime-2.1-mini` cached audio
 *  costs $0.30 against text's $0.06, yet audio is the cheaper place to put one,
 *  because it discounts a $10 input token where text discounts a $0.60 one. An
 *  adapter handed a cached count the provider did not split bills it here, so the
 *  unattributed part over-reports rather than hides spend. An unpriced model costs
 *  $0 whichever answer it gets, so it keeps the audio default. */
export declare function costliestCachedModality(model: string): "audio" | "text";
/** Whether this session's model can be priced at all, for the status response. */
export declare function isPricingKnown(model: string): boolean;
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