---
title: "Upload File"
method: POST
path: "/v1/files?beta=true"
---

# Upload File

`POST /v1/files?beta=true`

## Headers

- `anthropic-beta` string — Optional header to specify the beta version(s) you want to use. To use multiple betas, use a comma separated list like `beta1,beta2` or specify the header multiple times for each beta.
- `anthropic-version` string — The version of the Claude API you want to use. Read more about versioning and our version history [here](https://platform.claude.com/docs/en/api/versioning).
- `anthropic-workspace-id` string

## Response `200`

Successful Response

- BetaFileMetadataSchema
  - `created_at` string, date-time, required — RFC 3339 datetime string representing when the file was created.
  - `downloadable` boolean — Whether the file can be downloaded.
  - `expires_at` string, date-time, nullable — RFC 3339 datetime string representing when the file will expire and become unavailable for download. Null if the file does not expire. For files uploaded with `expires_in_seconds`, this is the upload time plus that value.
  - `filename` string, required — Original filename of the uploaded file.
  - `id` string, required — Unique object identifier. The format and length of IDs may change over time.
  - `mime_type` string, required — MIME type of the file.
  - `scope` BetaFileScope
    - `id` string, required — The ID of the scoping resource (e.g., the session ID).
    - `type` 'session', required — The type of scope (e.g., `"session"`).
  - `size_bytes` integer, required — Size of the file in bytes.
  - `type` 'file', required — Object type. For files, this is always `"file"`.

## Other responses

- `400` — Invalid argument - The client specified an invalid argument
- `401` — Unauthenticated - The request does not have valid authentication credentials
- `403` — Permission denied - The caller does not have permission to execute the specified operation
- `404` — Not found - Some requested entity was not found
- `408` — Deadline exceeded - The deadline expired before the operation could complete
- `409` — Aborted - The operation was aborted due to concurrency issue
- `412` — Failed precondition - Operation was rejected because the system is not in required state
- `413` — Out of range - Operation was attempted past the valid range
- `429` — Resource exhausted - Some resource has been exhausted (rate limiting)
- `431` — Request header fields too large - Request metadata was too large
- `499` — Cancelled - The operation was cancelled by the client
- `500` — Internal - Internal server error
- `501` — Unimplemented - The operation is not implemented or supported
- `503` — Unavailable - The service is currently unavailable
- `504` — Deadline exceeded - Upstream service did not respond in time
- `529` — Overloaded - The service is temporarily overloaded

## Changes

- **2026-09-02** `4789294140a2` — 17 info
  - added the new optional `header` request parameter `anthropic-workspace-id`
  - added the non-success response with the status `400`
  - added the non-success response with the status `401`
  - added the non-success response with the status `403`
  - …13 more
- **2026-08-27** `ef8360d7d2b6` — 2 info
  - added the new optional request property `expires_in_seconds`
  - added the optional property `expires_at` to the response with the `200` status
- **2026-08-18** `d3515f9e9eca` — 2 warning
  - removed the request property `expires_in_seconds`
  - removed the optional property `expires_at` from the response with the `200` status
- **2026-08-17** `d2b230555b7f` — 2 info
  - added the new optional request property `expires_in_seconds`
  - added the optional property `expires_at` to the response with the `200` status
- **2026-04-08** `69486316563e` — 1 info
  - added the optional property `scope` to the response with the `200` status

[Change history](https://skmtc.dev/anthropics/apis/anthropic-api/changes/v1/files?beta=true/post.md)

---

[API](https://skmtc.dev/anthropics/apis/anthropic-api.md) · [All operations](https://skmtc.dev/anthropics/apis/anthropic-api/llms.txt) · [OpenAPI document](https://skmtc.dev/anthropics/apis/anthropic-api/revisions/1bb7c7a0a4a9?raw)