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  "path": "/t/does-responses-api-support-stop-parameter-or-not/1379909#post_6",
  "publishedAt": "2026-04-28T04:05:38.000Z",
  "site": "https://community.openai.com",
  "textContent": "I tried the following request:\n\n\n    curl https://api.openai.com/v1/responses \\\n      -H \"Content-Type: application/json\" \\\n      -H \"Authorization: Bearer {My API Key}\" \\\n      -d '{\n        \"model\": \"gpt-4.1-mini\",\n        \"input\": \"Write a short bedtime story in two sentences. End the story with the marker .\",\n        \"stop\":[\"END\"]\n      }'\n\n\nand received the error response.\n\n\n    {\n      \"error\": {\n        \"message\": \"Unknown parameter: 'stop'. Did you mean 'store'?\",\n        \"type\": \"invalid_request_error\",\n        \"param\": \"stop\",\n        \"code\": \"unknown_parameter\"\n      }\n\n\nSo, it seems that the Responses API itself supports `stop` but not with REST API?",
  "title": "Does Responses API support `stop` parameter or not?"
}