Yeah I just tried it and got a 500 server error with no details as to why:

  POST "https://api.openai.com/v1/responses": 500 Internal Server Error {
    "message": "An error occurred while processing your request. You can retry your request, or contact us through our help center at help.openai.com if the error persists. Please include the request ID req_******************* in your message.",
    "type": "server_error",
    "param": null,
    "code": "server_error"
  }

Interestingly if you change to request the model foobar you get an error showing this:

  POST "https://api.openai.com/v1/responses": 400 Bad Request {
    "message": "Invalid value: 'blah'. Supported values are: 'gpt-image-1' and 'gpt-image-1-mini'.",
    "type": "invalid_request_error",
    "param": "tools[0].model",
    "code": "invalid_value"
  }