/**
 * model-prices.ts — Single source of truth for per-model pricing.
 *
 * Iter 31 — Previously the price table existed in three scripts (train-
 * bundled-krr.mjs, auto-retrain-router.mjs, calibration-check.mjs) AND was
 * derived from the openrouter-alts.json sidecar for the bundled list. As
 * cost-aware features land (trajectory outcomes, cost-savings observability,
 * cost-ceiling routing), they need ONE canonical price lookup. This module
 * is it.
 *
 * Prices are blended ($/Mtok) using a 1×input + 3×output mix, reflecting
 * the average input/output token ratio for code tasks. To compute spend
 * for a specific call:
 *
 *   const usd = costUsd(modelId, inputTokens, outputTokens);
 *
 * Unknown model ids fall back to a conservative $1/Mtok blended estimate
 * so callers always get a number (cost-tracking doesn't silently drop).
 *
 * Source: OpenRouter price page snapshot, ADR-149 bench dates.
 *
 * @module model-prices
 */
/** Per-million-token input and output prices ($USD). */
export interface ModelPrice {
    in: number;
    out: number;
}
/**
 * Curated price table. Keys are concrete model ids matching either
 * OpenRouter slugs or Anthropic SDK ids that the cost-optimal router can
 * choose. New models added via the registry sidecar should be reflected
 * here AS THEY ARE ADDED (no auto-sync); see ADR-149.
 */
export declare const MODEL_PRICES: Record<string, ModelPrice>;
/**
 * Blended $/Mtok using the 1× input + 3× output ratio. Used by the KRR
 * trainer (scripts/train-bundled-krr.mjs and others) as the cost feature
 * the cost-optimal selector divides quality by.
 */
export declare function blendedPrice(modelId: string): number;
/**
 * Compute USD spend for a single call. Cost = (input × $/Mtok_in +
 * output × $/Mtok_out) / 1_000_000.
 *
 * Returns 0 on missing usage and falls back to a conservative blended
 * estimate when the model is unknown — never returns undefined.
 */
export declare function costUsd(modelId: string | undefined, inputTokens: number | undefined, outputTokens: number | undefined): number;
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