export interface CostEstimate {
    inputCost: number;
    outputCost: number;
    total: number;
    known: boolean;
}
export declare function estimateCost(model: string, promptTokens: number, completionTokens: number): CostEstimate;
/** Whether a spend cap can actually be enforced for this model. */
export declare function hasKnownPricing(model: string): boolean;
export declare function formatCost(amount: number): string;
/**
 * A rate, short enough to sit in a row. Fractions of a cent still matter at a million tokens.
 *
 * Here rather than in model-catalog.ts, which is where it was, for a measured reason: the model
 * picker prints a rate during a render, so this one pure formatter cannot be awaited — and
 * model-catalog.ts imports buildClient from engine.js, so importing it to format a number put
 * 810ms of the OpenAI SDK, execa and ts-morph in front of KONECK's first frame. This module has
 * no imports at all. Re-exported from model-catalog.js so its own callers were unaffected.
 */
export declare function rateText(perMillion: number): string;
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