/**
 * Cost Tracker - Token usage and cost calculation for LLM benchmarking
 *
 * Pricing data based on official provider pricing (as of December 2024).
 * Prices are per 1M tokens (input/output).
 */
export interface ModelPricing {
    input: number;
    output: number;
}
export interface ModelCostData {
    input_tokens: number;
    output_tokens: number;
    cost: number;
}
export interface CostSummary {
    total_input_tokens: number;
    total_output_tokens: number;
    total_tokens: number;
    total_cost_usd: number;
    by_model: Record<string, ModelCostData>;
}
export interface TokenUsage {
    input_tokens: number;
    output_tokens: number;
    total_tokens: number;
    method: 'actual' | 'estimated';
}
export interface CostInfo {
    total_usd: number;
    input_cost_usd: number;
    output_cost_usd: number;
    model: string;
}
/**
 * Track token usage and calculate costs for LLM API calls.
 */
export declare class CostTracker {
    private totalInputTokens;
    private totalOutputTokens;
    private totalCost;
    private modelCosts;
    /**
     * Normalize model name for pricing lookup.
     */
    static normalizeModelName(model: string): string;
    /**
     * Get pricing for a specific model.
     */
    static getModelPricing(model: string): ModelPricing;
    /**
     * Calculate cost for token usage.
     */
    static calculateCost(inputTokens: number, outputTokens: number, model: string): number;
    /**
     * Estimate tokens from text (rough approximation: 1 token ≈ 4 characters).
     */
    static estimateTokens(text: string): number;
    /**
     * Extract token usage from OpenAI API response.
     */
    static extractTokenUsage(response: Record<string, unknown>): {
        input: number;
        output: number;
    };
    /**
     * Add token usage to tracker.
     */
    addUsage(inputTokens: number, outputTokens: number, model: string, cost?: number): void;
    /**
     * Get cost tracking summary.
     */
    getSummary(): CostSummary;
    /**
     * Reset tracker.
     */
    reset(): void;
}
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