Example

curl https://api.openai.com/v1/responses/$RESPONSE_ID/input_items \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "data": [
    {
      "id": "id",
      "content": [
        {
          "text": "text",
          "type": "input_text",
          "prompt_cache_breakpoint": {
            "mode": "explicit"
          }
        }
      ],
      "role": "user",
      "type": "message",
      "status": "in_progress"
    }
  ],
  "first_id": "first_id",
  "has_more": true,
  "last_id": "last_id",
  "object": "list"
}