@type t() :: %ExOpenAI.Components.UsageAudioSpeechesResult{
  api_key_id: String.t() | nil,
  characters: integer(),
  model: String.t() | nil,
  num_model_requests: integer(),
  object: :"organization.usage.audio_speeches.result",
  project_id: String.t() | nil,
  user_id: String.t() | nil
}