File Attachments

Send images and PDF documents as part of your message request.

Example request

Python

import os
import base64
import anthropic
 
client = anthropic.Anthropic(
    api_key="<API_KEY>",,
    base_url='https://llm.onerouter.pro'
)
 
# Read files as base64
with open('./document.pdf', 'rb') as f:
    pdf_base64 = base64.b64encode(f.read()).decode('utf-8')
 
with open('./image.png', 'rb') as f:
    image_base64 = base64.b64encode(f.read()).decode('utf-8')
 
message = client.messages.create(
    model='claude-sonnet-4-5@20250929',
    max_tokens=1024,
    messages=[
        {
            'role': 'user',
            'content': [
                {
                    'type': 'document',
                    'source': {
                        'type': 'base64',
                        'media_type': 'application/pdf',
                        'data': pdf_base64,
                    },
                },
                {
                    'type': 'image',
                    'source': {
                        'type': 'base64',
                        'media_type': 'image/png',
                        'data': image_base64,
                    },
                },
                {
                    'type': 'text',
                    'text': 'Please summarize the PDF and describe the image.',
                },
            ],
        }
    ],
)
 
print('Response:', message.content[0].text)

TypeScript

Supported file types

• Images: image/jpeg, image/png, image/gif, image/webp

• Documents: application/pdf