added baseUrl constant & /models endpoint

src/init.luau

@@ -162,14 +162,25 @@ export type CompletionsRequest = {
     }?
 }
 
+export type ModelsResponse = {
+    data : {
+        created: number,
+        id: string,
+        object: "model",
+        owned_by: string
+    },
+    object: "list"
+}
+
 local xai = {}
+local baseUrl = "https://api.x.ai/v1"
 
 function xai.create(api_key: string)
     local client = {}
 
-    function client.completions(self, request: CompletionsRequest): CompletionsResponse
+    function client:completions(request: CompletionsRequest): CompletionsResponse
         local config = {
-            url = "https://api.x.ai/v1/chat/completions",
+            url = `{baseUrl}/completions`,
             method = "POST",
             headers = {
                 Authorization = "Bearer " .. api_key,
@@ -186,6 +197,23 @@ function xai.create(api_key: string)
         end
     end
 
+    function client:models(): ModelsResponse
+        local config = {
+            url = `{baseUrl}/models`,
+            method = "GET",
+            headers = {
+                ["Content-Type"] = "application/json",
+            },
+        }
+        local response = net.request(config)
+        if response.ok then
+            local decoded: ModelsResponse = serde.decode("json", response.body)
+            return decoded
+        else
+            error(`API request failed with status {response.statusCode}: {response.statusMessage}`)
+        end
+    end
+
     return client
 end