/**
 * Calculate the cost of a request based on the model used.
 * Falls back to conservative estimates for unknown models.
 */
export declare function calculateCost(modelId: string, inputTokens: number, outputTokens: number): number;
/**
 * Get the per-token costs for a specific model.
 * Returns null if model is not in the registry.
 */
export declare function getModelPricing(modelId: string): {
    inputPerToken: number;
    outputPerToken: number;
};
/**
 * Check if a model has known pricing.
 */
export declare function hasKnownPricing(modelId: string): boolean;
/**
 * Get all known model IDs for a given provider prefix.
 */
export declare function getModelsForProvider(providerPrefix: string): string[];
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