import { type RuntimeUsage } from "../runtime-usage.js";
export { mergeRuntimeUsage, readGatewayBillingMode, sanitizeRuntimeUsage, } from "../runtime-usage.js";
export type { GatewayBillingMode, RuntimeUsage } from "../runtime-usage.js";
export declare function extractAnthropicUsage(payload: unknown): RuntimeUsage | undefined;
export declare function extractGoogleUsage(payload: unknown): RuntimeUsage | undefined;
export declare function extractOpenAIUsage(payload: unknown): RuntimeUsage | undefined;
/**
 * The Responses API uses `input_tokens` / `output_tokens` field names
 * instead of Chat Completions' `prompt_tokens` / `completion_tokens`.
 * It also nests cached input tokens under `input_tokens_details` and
 * exposes reasoning tokens via `output_tokens_details.reasoning_tokens`.
 */
export declare function extractOpenAIResponsesUsage(payload: unknown): RuntimeUsage | undefined;
/** Merge provider usage counters. */
export declare function mergeUsage(current: RuntimeUsage | undefined, next: RuntimeUsage | undefined): RuntimeUsage | undefined;
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