FilePurpose:
    | "assistants"
    | "batch"
    | "fine-tune"
    | "vision"
    | "user_data"
    | "evals"

The intended purpose of the uploaded file. One of: - assistants: Used in the Assistants API - batch: Used in the Batch API - fine-tune: Used for fine-tuning - vision: Images used for vision fine-tuning - user_data: Flexible file type for any purpose - evals: Used for eval data sets