如何查找GPT Builder创建的GPT的Engine ID？Swift代码相关疑问

我用OpenAI的GPT Builder创建了自定义GPT，但不知道从哪获取对应的Engine ID来填入以下Swift代码的YOUR_ENGINE_ID位置：

import Foundation

class GPTManager {
    private let apiKey = "MY KEY HERE"
    private let session = URLSession.shared
    private let baseUrl = "https://api.openai.com/v1/engines/YOUR_ENGINE_ID/completions"

    func getResponse(prompt: String, completion: @escaping (String?) -> Void) {
        guard let url = URL(string: baseUrl) else {
            completion(nil)
            return
        }

        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.addValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")

        let body: [String: Any] = [
            "prompt": prompt,
            "max_tokens": 100
        ]

        request.httpBody = try? JSONSerialization.data(withJSONObject: body, options: [])

        let task = session.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {
                completion(nil)
                return
            }

            if let responseDictionary = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any],
               let text = responseDictionary["choices"] as? [[String: Any]],
               let firstChoice = text.first,
               let finalText = firstChoice["text"] as? String {
                DispatchQueue.main.async {
                    completion(finalText.trimmingCharacters(in: .whitespacesAndNewlines))
                }
            } else {
                completion(nil)
            }
        }

        task.resume()
    }
}

首先要明确：GPT Builder创建的自定义GPT，并不对应OpenAI API中的「Engine ID」——你的代码用的是旧版的/engines/{engine_id}/completions接口，仅适用于基础文本模型（如gpt-3.5-turbo-instruct、text-davinci-003），无法直接调用自定义GPT。

情况1：要调用自己创建的自定义GPT #

自定义GPT基于OpenAI Assistant框架构建，需通过Assistant API调用：

• 1. 打开GPT Builder的「Configure」页面，找到「API」选项并开启访问权限，此时会生成对应的Assistant ID（替代Engine ID）。
• 2. 修改代码使用Assistant API的接口（路径为https://api.openai.com/v1/assistants/{assistant_id}/threads/runs），接口逻辑与completions接口不同，需要创建线程、添加消息、触发运行等步骤。

情况2：仅需调用基础GPT模型（无需自定义GPT） #

直接使用基础模型的ID即可，推荐使用新版Chat Completions接口（更适配聊天类模型，如gpt-3.5-turbo、gpt-4），修正后的代码示例：

import Foundation

class GPTManager {
    private let apiKey = "MY KEY HERE"
    private let session = URLSession.shared
    private let baseUrl = "https://api.openai.com/v1/chat/completions"

    func getResponse(prompt: String, completion: @escaping (String?) -> Void) {
        guard let url = URL(string: baseUrl) else {
            completion(nil)
            return
        }

        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.addValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")

        let body: [String: Any] = [
            "model": "gpt-3.5-turbo", // 替换为目标模型ID，如gpt-4
            "messages": [
                ["role": "user", "content": prompt]
            ],
            "max_tokens": 100
        ]

        request.httpBody = try? JSONSerialization.data(withJSONObject: body, options: [])

        let task = session.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {
                completion(nil)
                return
            }

            if let responseDictionary = try? JSONSerialization.jsonObject(with: data, options: []) as? [String: Any],
               let choices = responseDictionary["choices"] as? [[String: Any]],
               let firstChoice = choices.first,
               let message = firstChoice["message"] as? [String: Any],
               let finalText = message["content"] as? String {
                DispatchQueue.main.async {
                    completion(finalText.trimmingCharacters(in: .whitespacesAndNewlines))
                }
            } else {
                completion(nil)
            }
        }

        task.resume()
    }
}

如果坚持用旧版completions接口，可将baseUrl改为https://api.openai.com/v1/completions，并在请求体中添加"model": "gpt-3.5-turbo-instruct"这类兼容模型的ID，无需在URL中填Engine ID。

内容的提问来源于stack exchange，提问作者user23331581