I’m currently building a school project and we’re using ChatGPT API inside to have more customization.

This is my current code to setup the request:

let url = URL(string: "https://api.openai.com/v1/assistants/(assistant_id)/chat/completions")!
        
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.addValue("Bearer (String(describing: self.apiKey!))", forHTTPHeaderField: "Authorization")
        request.addValue("assistants=v2", forHTTPHeaderField: "OpenAI-Beta")
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        
        let body: [String: Any] = [
            "model": "gpt-4-turbo", 
            "messages": [
                ["role": "user", "content": prompt]
            ]
        ]

But I only get this response from the API:

Invalid URL (POST /v1/assistants/MY_ASSIST_ID/chat/completions)

(where MY_ASSIST_ID is my assistant ID)

I think the URL is wrong as it says but I can’t find the right URL.
Can someone help me and explain what’s wrong please?