Files

Upload and manage files with Anthropic through Portkey

Portkey supports Anthropic’s Files API (beta), enabling you to upload, list, retrieve, and delete files through the gateway. Uploaded files can be referenced in chat completions using file_id instead of re-uploading content each request.

The Files API is in beta and requires the files-api-2025-04-14 beta header. Portkey sets this automatically for file endpoints when using the SDK. For cURL requests, include the anthropic-beta: files-api-2025-04-14 header.

Upload a file

Python

from portkey_ai import Portkey

portkey = Portkey(
    api_key="PORTKEY_API_KEY",
    provider="@anthropic"
)

file = portkey.files.create(
    purpose="assistants",
    file=open("document.pdf", "rb")
)

print(file.id)

NodeJS

import Portkey from 'portkey-ai';
import fs from 'fs';

const portkey = new Portkey({
    apiKey: "PORTKEY_API_KEY",
    provider: "@anthropic"
});

const file = await portkey.files.create({
    purpose: "assistants",
    file: fs.createReadStream("document.pdf")
});

console.log(file.id);

REST

curl -X POST https://api.portkey.ai/v1/files \
  -H "x-portkey-api-key: $PORTKEY_API_KEY" \
  -H "x-portkey-provider: @anthropic" \
  -H "anthropic-beta: files-api-2025-04-14" \
  -F 'file=@"document.pdf"'

OpenAI Python

from openai import OpenAI
from portkey_ai import PORTKEY_GATEWAY_URL, createHeaders

client = OpenAI(
    api_key="PORTKEY_API_KEY",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="@anthropic",
        api_key="PORTKEY_API_KEY"
    )
)

file = client.files.create(
    purpose="assistants",
    file=open("document.pdf", "rb")
)

print(file.id)

OpenAI NodeJS

import OpenAI from 'openai';
import { PORTKEY_GATEWAY_URL, createHeaders } from 'portkey-ai';
import fs from 'fs';

const client = new OpenAI({
    apiKey: "PORTKEY_API_KEY",
    baseURL: PORTKEY_GATEWAY_URL,
    defaultHeaders: createHeaders({
        provider: "@anthropic",
        apiKey: "PORTKEY_API_KEY"
    })
});

const file = await client.files.create({
    purpose: "assistants",
    file: fs.createReadStream("document.pdf")
});

console.log(file.id);

Use uploaded files in chat completions

Once a file is uploaded, reference it by file_id in your chat completions requests:

Python

from portkey_ai import Portkey

portkey = Portkey(api_key="PORTKEY_API_KEY")

response = portkey.chat.completions.create(
    model="@anthropic/claude-sonnet-4-5-20250929",
    max_tokens=1024,
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "Please summarize this document."},
            {"type": "file", "file": {"file_id": "<file_id>", "mime_type": "application/pdf"}}
        ]
    }]
)

print(response.choices[0].message.content)

NodeJS

import Portkey from 'portkey-ai';

const portkey = new Portkey({
    apiKey: "PORTKEY_API_KEY"
});

const response = await portkey.chat.completions.create({
    model: "@anthropic/claude-sonnet-4-5-20250929",
    max_tokens: 1024,
    messages: [{
        role: "user",
        content: [
            { type: "text", text: "Please summarize this document." },
            { type: "file", file: { file_id: "<file_id>", mime_type: "application/pdf" } }
        ]
    }]
});

console.log(response.choices[0].message.content);

REST

curl -X POST https://api.portkey.ai/v1/chat/completions \
  -H "x-portkey-api-key: $PORTKEY_API_KEY" \
  -H "anthropic-beta: files-api-2025-04-14" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "@anthropic/claude-sonnet-4-5-20250929",
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": [
          {
            "type": "text",
            "text": "Please summarize this document."
          },
          {
            "type": "file",
            "file": {
              "file_id": "<file_id>",
              "mime_type": "application/pdf"
            }
          }
        ]
      }
    ]
  }'

When using the SDK, the anthropic-beta header is set automatically for file endpoints. For chat completions with file references via cURL, include anthropic-beta: files-api-2025-04-14 in your request headers.

List files

Python

from portkey_ai import Portkey

portkey = Portkey(
    api_key="PORTKEY_API_KEY",
    provider="@anthropic"
)

files = portkey.files.list()

print(files)

NodeJS

import Portkey from 'portkey-ai';

const portkey = new Portkey({
    apiKey: "PORTKEY_API_KEY",
    provider: "@anthropic"
});

const files = await portkey.files.list();

console.log(files);

REST

curl https://api.portkey.ai/v1/files \
  -H "x-portkey-api-key: $PORTKEY_API_KEY" \
  -H "x-portkey-provider: @anthropic" \
  -H "anthropic-beta: files-api-2025-04-14"

OpenAI Python

from openai import OpenAI
from portkey_ai import PORTKEY_GATEWAY_URL, createHeaders

client = OpenAI(
    api_key="PORTKEY_API_KEY",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="@anthropic",
        api_key="PORTKEY_API_KEY"
    )
)

files = client.files.list()

print(files)

OpenAI NodeJS

import OpenAI from 'openai';
import { PORTKEY_GATEWAY_URL, createHeaders } from 'portkey-ai';

const client = new OpenAI({
    apiKey: "PORTKEY_API_KEY",
    baseURL: PORTKEY_GATEWAY_URL,
    defaultHeaders: createHeaders({
        provider: "@anthropic",
        apiKey: "PORTKEY_API_KEY"
    })
});

const files = await client.files.list();

console.log(files);

Get file

Python

from portkey_ai import Portkey

portkey = Portkey(
    api_key="PORTKEY_API_KEY",
    provider="@anthropic"
)

file = portkey.files.retrieve(file_id="<file_id>")

print(file)

NodeJS

import Portkey from 'portkey-ai';

const portkey = new Portkey({
    apiKey: "PORTKEY_API_KEY",
    provider: "@anthropic"
});

const file = await portkey.files.retrieve("<file_id>");

console.log(file);

REST

curl https://api.portkey.ai/v1/files/<file_id> \
  -H "x-portkey-api-key: $PORTKEY_API_KEY" \
  -H "x-portkey-provider: @anthropic" \
  -H "anthropic-beta: files-api-2025-04-14"

OpenAI Python

from openai import OpenAI
from portkey_ai import PORTKEY_GATEWAY_URL, createHeaders

client = OpenAI(
    api_key="PORTKEY_API_KEY",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="@anthropic",
        api_key="PORTKEY_API_KEY"
    )
)

file = client.files.retrieve("<file_id>")

print(file)

OpenAI NodeJS

import OpenAI from 'openai';
import { PORTKEY_GATEWAY_URL, createHeaders } from 'portkey-ai';

const client = new OpenAI({
    apiKey: "PORTKEY_API_KEY",
    baseURL: PORTKEY_GATEWAY_URL,
    defaultHeaders: createHeaders({
        provider: "@anthropic",
        apiKey: "PORTKEY_API_KEY"
    })
});

const file = await client.files.retrieve("<file_id>");

console.log(file);

Delete file

Python

from portkey_ai import Portkey

portkey = Portkey(
    api_key="PORTKEY_API_KEY",
    provider="@anthropic"
)

response = portkey.files.delete(file_id="<file_id>")

print(response)

NodeJS

import Portkey from 'portkey-ai';

const portkey = new Portkey({
    apiKey: "PORTKEY_API_KEY",
    provider: "@anthropic"
});

const response = await portkey.files.delete("<file_id>");

console.log(response);

REST

curl -X DELETE https://api.portkey.ai/v1/files/<file_id> \
  -H "x-portkey-api-key: $PORTKEY_API_KEY" \
  -H "x-portkey-provider: @anthropic" \
  -H "anthropic-beta: files-api-2025-04-14"

OpenAI Python

from openai import OpenAI
from portkey_ai import PORTKEY_GATEWAY_URL, createHeaders

client = OpenAI(
    api_key="PORTKEY_API_KEY",
    base_url=PORTKEY_GATEWAY_URL,
    default_headers=createHeaders(
        provider="@anthropic",
        api_key="PORTKEY_API_KEY"
    )
)

response = client.files.delete("<file_id>")

print(response)

OpenAI NodeJS

import OpenAI from 'openai';
import { PORTKEY_GATEWAY_URL, createHeaders } from 'portkey-ai';

const client = new OpenAI({
    apiKey: "PORTKEY_API_KEY",
    baseURL: PORTKEY_GATEWAY_URL,
    defaultHeaders: createHeaders({
        provider: "@anthropic",
        apiKey: "PORTKEY_API_KEY"
    })
});

const response = await client.files.delete("<file_id>");

console.log(response);

Supported file types

Anthropic’s Files API supports the following file types:

Type	MIME types
PDF	application/pdf
Images	image/jpeg, image/png, image/gif, image/webp

Limitations

• The Files API is only available on direct Anthropic API — it is not supported on Bedrock or Vertex AI
• Files API is currently in beta and requires the files-api-2025-04-14 beta header for cURL requests
• Refer to Anthropic’s documentation for the latest file size and rate limits