Chat With File Attachments

Chat with File Attachments

post

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

Header parameters

AuthorizationstringRequiredExample: sk-lZxz

Body

modelstringRequired

streambooleanRequired

Responses

200Success

application/json

costnumberRequired

idstringRequired

modelstringRequired

rolestringRequired

stop_reasonstringRequired

stop_sequencenullRequired

typestringRequired

post/v1/messages

POST /v1/messages HTTP/1.1
Host: llm.onerouter.pro
Authorization: text
Content-Type: application/json
Accept: */*
Content-Length: 1287

{
  "model": "anthropic/claude-opus-4.5",
  "messages": [
    {
      "role": "user",
      "content": [
        {
          "type": "document",
          "source": {
            "type": "base64",
            "media_type": "application/pdf",
            "data": "JVBERi0xLjEKMSAwIG9iago8PCAvVHlwZSAvQ2F0YWxvZyAvUGFnZXMgMiAwIFIgPj4KZW5kb2JqCjIgMCBvYmoKPDwgL1R5cGUgL1BhZ2VzIC9LaWRzIFszIDAgUl0gL0NvdW50IDEgPj4KZW5kb2JqCjMgMCBvYmoKPDwgL1R5cGUgL1BhZ2UgL1BhcmVudCAyIDAgUiAvTWVkaWFCb3ggWzAgMCAzMDAgMTQ0XSAvQ29udGVudHMgNCAwIFIgL1Jlc291cmNlcyA8PCAvRm9udCA8PCAvRjEgNSAwIFIgPj4gPj4gPj4KZW5kb2JqCjQgMCBvYmoKPDwgL0xlbmd0aCAzNyA+PgpzdHJlYW0KQlQKL0YxIDI0IFRmCjcyIDcyIFRkCihIZWxsbyBQREYpIFRqCkVUCmVuZHN0cmVhbQplbmRvYmoKNSAwIG9iago8PCAvVHlwZSAvRm9udCAvU3VidHlwZSAvVHlwZTEgL0Jhc2VGb250IC9IZWx2ZXRpY2EgPj4KZW5kb2JqCnhyZWYKMCA2CjAwMDAwMDAwMDAgNjU1MzUgZiAKMDAwMDAwMDAwOSAwMDAwMCBuIAowMDAwMDAwMDU4IDAwMDAwIG4gCjAwMDAwMDAxMTUgMDAwMDAgbiAKMDAwMDAwMDI0MSAwMDAwMCBuIAowMDAwMDAwMzI4IDAwMDAwIG4gCnRyYWlsZXIKPDwgL1Jvb3QgMSAwIFIgL1NpemUgNiA+PgpzdGFydHhyZWYKMzk4CiUlRU9GCg=="
          }
        },
        {
          "type": "image",
          "source": {
            "type": "base64",
            "media_type": "image/png",
            "data": "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAFklEQVR4nGP8z8DAwMDAxMDAwMDAAAANHQEDasKb6QAAAABJRU5ErkJggg=="
          }
        },
        {
          "type": "text",
          "text": "Please summarize the PDF and describe the image."
        }
      ]
    }
  ],
  "stream": false,
  "stream_options": {
    "include_usage": true
  },
  "usage": {
    "include": true
  }
}

200Success

{
  "content": [
    {
      "text": "## Summary\n\nThe PDF contains a single page with minimal content - just the text \"Hello PDF\" displayed prominently in the center of the page.\n\n## Image Description\n\nThe image shows a simple, clean white page with the words **\"Hello PDF\"** displayed in large, black sans-serif font, centered both horizontally and vertically on the page. The design is minimalist with no other visual elements, borders, or decorations - just the two-word greeting against a plain white background.\n\nThis appears to be a basic test or sample PDF document, commonly used to verify that PDF viewing or processing functionality is working correctly.",
      "type": "text"
    }
  ],
  "cost": 0.011225,
  "cost_details": {
    "audio_cost": 0,
    "byok_cost": 0,
    "completion_cost": 0.003325,
    "discount_rate": 1,
    "image_cost": 0,
    "is_byok": false,
    "native_web_search_cost": 0,
    "plugin_web_search_cost": 0,
    "prompt_cache_read_cost": 0,
    "prompt_cache_write_1_h": 0,
    "prompt_cache_write_5_min": 0,
    "prompt_cache_write_cost": 0,
    "prompt_cost": 0.0079,
    "reasoning_cost": 0,
    "tools_cost": 0,
    "video_cost": 0
  },
  "id": "msg_bdrk_012N3Bsu451RsjNbgjv3DXri",
  "model": "anthropic/claude-opus-4.5",
  "role": "assistant",
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "type": "message",
  "usage": {
    "cache_creation": {
      "ephemeral_1h_input_tokens": 0,
      "ephemeral_5m_input_tokens": 0
    },
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 0,
    "input_tokens": 1580,
    "output_tokens": 133
  }
}