1.5-flash response:
{
  "error": {
    "code": 404,
    "message": "models/gemini-1.5-flash is not found for API version v1beta, or is not supported for generateContent. Call ModelService.ListModels to see the list of available models and their supported methods.",
    "status": "NOT_FOUND"
  }
}


gemini-pro response:
{
  "error": {
    "code": 404,
    "message": "models/gemini-pro is not found for API version v1beta, or is not supported for generateContent. Call ModelService.ListModels to see the list of available models and their supported methods.",
    "status": "NOT_FOUND"
  }
}