diff --git a/src/auto.ts b/src/auto.ts
index 77497d2..91f07c7 100644
--- a/src/auto.ts
+++ b/src/auto.ts
@@ -56,7 +56,7 @@ async function runTask(
     snapshot: await getSnapshot(page),
     options: options
       ? {
-          model: options.model ?? "gpt-4-1106-preview",
+          model: options.model ?? "gpt-4o",
           debug: options.debug ?? false,
           openaiApiKey: options.openaiApiKey,
           openaiBaseUrl: options.openaiBaseUrl,
diff --git a/src/completeTask.ts b/src/completeTask.ts
index a387a07..166e21a 100644
--- a/src/completeTask.ts
+++ b/src/completeTask.ts
@@ -25,7 +25,7 @@ export const completeTask = async (
 
   const runner = openai.beta.chat.completions
     .runTools({
-      model: task.options?.model ?? "gpt-4-1106-preview",
+      model: task.options?.model ?? "gpt-4o",
       messages: [{ role: "user", content: prompt(task) }],
       tools: Object.values(actions).map((action) => ({
         type: "function",
@@ -39,9 +39,13 @@ export const completeTask = async (
 
       if (
         message.role === "assistant" &&
-        message.function_call?.name.startsWith("result")
+        message.tool_calls &&
+        message.tool_calls.length > 0 &&
+        message.tool_calls[0].function.name.startsWith("result")
       ) {
-        lastFunctionResult = JSON.parse(message.function_call.arguments);
+        lastFunctionResult = JSON.parse(
+          message.tool_calls[0].function.arguments
+        );
       }
     });