Interface Usage

interface Usage {
    prompt_tokens: number;
    completion_tokens: number;
    total_tokens: number;
    prompt_cache_hit_tokens?: number;
    prompt_cache_miss_tokens?: number;
    completion_tokens_details?: {
        reasoning_tokens?: number;
        audio_tokens?: number;
        accepted_prediction_tokens?: number;
        rejected_prediction_tokens?: number;
    };
    prompt_tokens_details?: { cached_tokens?: number; audio_tokens?: number };
}