Missing image_url in image input

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1 
{
  "model" : "gpt-4.1",
  "metadata" : {
    "test" : "image_response"
  },
  "input" : [
    {
      "content" : [
        {
          "text" : "what is in this image?",
          "type" : "input_text"
        },
        {
          "image_url" : "https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/d\/dd\/Gfp-wisconsin-madison-the-nature-boardwalk.jpg\/2560px-Gfp-wisconsin-madison-the-nature-boardwalk.jpg",
          "type" : "input_image"
        }
      ],
      "role" : "user"
    }
  ]
}

results in:

{
  "id": "resp_680bf09665008191a4dc0f9a3e66d4de0310810e8956d750",
  "object": "response",
  "created_at": 1745612950,
  "status": "completed",
  "error": null,
  "incomplete_details": null,
  "instructions": null,
  "max_output_tokens": null,
  "model": "gpt-4.1-2025-04-14",
  "output": [
    {
      "id": "msg_680bf0971d4c8191aa82e533673378120310810e8956d750",
      "type": "message",
      "status": "completed",
      "content": [
        {
          "type": "output_text",
          "annotations": [],
          "text": "This image shows a wooden boardwalk or pathway running through a lush, green field or meadow. The path is surrounded by tall grass and some bushes. In the background, there are more trees and vegetation under a bright blue sky with scattered clouds. The scene looks peaceful and is likely taken during spring or summer."
        }
      ],
      "role": "assistant"
    }
  ],
  "parallel_tool_calls": true,
  "previous_response_id": null,
  "reasoning": {
    "effort": null,
    "summary": null
  },
  "service_tier": "default",
  "store": true,
  "temperature": 1.0,
  "text": {
    "format": {
      "type": "text"
    }
  },
  "tool_choice": "auto",
  "tools": [],
  "top_p": 1.0,
  "truncation": "disabled",
  "usage": {
    "input_tokens": 1118,
    "input_tokens_details": {
      "cached_tokens": 0
    },
    "output_tokens": 63,
    "output_tokens_details": {
      "reasoning_tokens": 0
    },
    "total_tokens": 1181
  },
  "user": null,
  "metadata": {
    "test": "image_response"
  }
}

When I then list the input items for this response:

{
  "object": "list",
  "data": [
    {
      "id": "msg_680bf09665488191a98769dd8ef8c8b70310810e8956d750",
      "type": "message",
      "status": "completed",
      "content": [
        {
          "type": "input_text",
          "text": "what is in this image?"
        },
        {
          "type": "input_image",
          "detail": "auto",
          "file_id": null,
          "image_url": null
        }
      ],
      "role": "user"
    }
  ],
  "first_id": "msg_680bf09665488191a98769dd8ef8c8b70310810e8956d750",
  "has_more": false,
  "last_id": "msg_680bf09665488191a98769dd8ef8c8b70310810e8956d750"
}

I believe it to be an error, that "image_url": null instead of the Wikipedia URL.

2 Likes
2

I found that the URL gets included if I pass include[]=message.input_image.image_url - However I believe when you don’t there shouldn’t be a null - rather the value should be omitted.

2 Likes