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python/resources/files/methods/create/index.md 2026-07-07 08:02 UTC to 2026-07-09 20:58 UTC

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Upload file

files.create(FileCreateParams**kwargs) -> FileObject

post /files

Upload file

Parameters

  • file: FileTypes

    The File object (not file name) to be uploaded.

  • purpose: object

  • expires_after: Optional[ExpiresAfter]

    The expiration policy for a file. By default, files with purpose=batch expire after 30 days and all other files are persisted until they are manually deleted.

    • anchor: Literal["created_at"]

      Anchor timestamp after which the expiration policy applies. Supported anchors: created_at.

      • "created_at"

    • seconds: int

      The number of seconds after the anchor time that the file will expire. Must be between 3600 (1 hour) and 2592000 (30 days).

Returns

  • class FileObject: …

    The File object represents a document that has been uploaded to OpenAI.

    • id: str

      The file identifier, which can be referenced in the API endpoints.

    • bytes: int

      The size of the file, in bytes.

    • created_at: int

      The Unix timestamp (in seconds) for when the file was created.

    • filename: str

      The name of the file.

    • object: Literal["file"]

      The object type, which is always file.

      • "file"

    • purpose: Literal["assistants", "assistants_output", "batch", 5 more]

      The intended purpose of the file. Supported values are assistants, assistants_output, batch, batch_output, fine-tune, fine-tune-results, vision, and user_data.

      • "assistants"

      • "assistants_output"

      • "batch"

      • "batch_output"

      • "fine-tune"

      • "fine-tune-results"

      • "vision"

      • "user_data"

    • status: Literal["uploaded", "processed", "error"]

      Deprecated. The current status of the file, which can be either uploaded, processed, or error.

      • "uploaded"

      • "processed"

      • "error"

    • expires_at: Optional[int]

      The Unix timestamp (in seconds) for when the file will expire.

    • status_details: Optional[str]

      Deprecated. For details on why a fine-tuning training file failed validation, see the error field on fine_tuning.job.

Example

import os
from openai import OpenAI

client = OpenAI(
    api_key=os.environ.get("OPENAI_API_KEY"),  # This is the default and can be omitted
)
file_object = client.files.create(
    file=b"Example data",
    purpose={},
)
print(file_object.id)

Response

{
  "id": "id",
  "bytes": 0,
  "created_at": 0,
  "filename": "filename",
  "object": "file",
  "purpose": "assistants",
  "status": "uploaded",
  "expires_at": 0,
  "status_details": "status_details"
}

Example

from openai import OpenAI
client = OpenAI()

client.files.create(
  file=open("mydata.jsonl", "rb"),
  purpose="fine-tune",
  expires_after={
    "anchor": "created_at",
    "seconds": 2592000
  }
)

Response

{
  "id": "file-abc123",
  "object": "file",
  "bytes": 120000,
  "created_at": 1677610602,
  "expires_at": 1677614202,
  "filename": "mydata.jsonl",
  "purpose": "fine-tune",
}