import type { ModelRate } from "./budget.js";
/**
 * The flat representative rate (USD / million tokens) the BudgetMeter applies to the `max_usd` cap
 * ONLY as the fallback for a turn with no real upstream cost (BYO / unavailable); a managed turn caps
 * on its exact `usage.cost`. Sonnet-class list pricing — a model-agnostic backstop, not the billed price.
 */
export declare const BUDGET_GUARDRAIL_RATE: ModelRate;