Example

curl https://api.openai.com/v1/conversations/$CONVERSATION_ID/items/$ITEM_ID \
    -H "Authorization: Bearer $OPENAI_API_KEY"

Response

{
  "id": "id",
  "content": [
    {
      "text": "text",
      "type": "input_text",
      "prompt_cache_breakpoint": {
        "mode": "explicit"
      }
    }
  ],
  "role": "unknown",
  "status": "in_progress",
  "type": "message",
  "phase": "commentary"
}