目前 moonshot 的 chat completions 接口出现故障，所有请求都会返回 400 错误, 响应结果为: 
{
    "error": {
        "message": "Invalid request: tokenism error no such model:  err model \"\" is not available",
        "type": "invalid_request_error"
    }
}

官方调用示例同样报错 
curl https://api.moonshot.cn/v1/chat/completions \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $MOONSHOT_API_KEY" \
    -d '{
   ...