POST
/
v1
/
messages
curl -X POST https://www.anyfast.ai/v1/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-haiku-4-5-20251001",
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": [
          {
            "type": "document",
            "source": {
              "type": "url",
              "url": "https://assets.anthropic.com/m/1cd9d098ac3e6467/original/Claude-3-Model-Card-October-Addendum.pdf"
            }
          },
          {
            "type": "text",
            "text": "Please summarize this document."
          }
        ]
      }
    ]
  }'

{
  "id": "msg_01XFDUDYJgAACzvnptvVoYEL",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "text",
      "text": "This document is about..."
    }
  ],
  "model": "claude-haiku-4-5-20251001",
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 2500,
    "output_tokens": 200
  }
}
Official documentation: https://docs.anthropic.com/en/docs/build-with-claude/pdf-support
Use Claude models to read and analyze PDF documents in native format. Supports both URL and base64 input.

​
Request Parameters

​
model
string
required
The model to use. Recommended: claude-haiku-4-5-20251001
​
max_tokens
integer
required
The maximum number of tokens to generate.
​
messages
array
required
Messages array with document content blocks.

​
Document Content Types

​
URL-based PDF

{
  "type": "document",
  "source": {
    "type": "url",
    "url": "https://example.com/document.pdf"
  }
}

​
Base64-encoded PDF

{
  "type": "document",
  "source": {
    "type": "base64",
    "media_type": "application/pdf",
    "data": "JVBERi0xLjcK..."
  },
  "cache_control": {
    "type": "ephemeral"
  }
}

curl -X POST https://www.anyfast.ai/v1/messages \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-haiku-4-5-20251001",
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": [
          {
            "type": "document",
            "source": {
              "type": "url",
              "url": "https://assets.anthropic.com/m/1cd9d098ac3e6467/original/Claude-3-Model-Card-October-Addendum.pdf"
            }
          },
          {
            "type": "text",
            "text": "Please summarize this document."
          }
        ]
      }
    ]
  }'

{
  "id": "msg_01XFDUDYJgAACzvnptvVoYEL",
  "type": "message",
  "role": "assistant",
  "content": [
    {
      "type": "text",
      "text": "This document is about..."
    }
  ],
  "model": "claude-haiku-4-5-20251001",
  "stop_reason": "end_turn",
  "usage": {
    "input_tokens": 2500,
    "output_tokens": 200
  }
}