diff --git a/scripts/konjacbot/pr.mts b/scripts/konjacbot/pr.mts
index f832093..5b36835 100644
--- a/scripts/konjacbot/pr.mts
+++ b/scripts/konjacbot/pr.mts
@@ -27,6 +27,7 @@ const defaults = {
     github: 'https://github.com/vercel/next.js',
     web: 'https://nextjs.org/docs',
   },
+  model: 'gpt-4o',
 } as const
 
 $.verbose = true
@@ -94,7 +95,10 @@ async function buildPRSummary(): Promise<string> {
     new OpenAI({
       apiKey: defaults.apiKey,
       maxRetries: defaults.maxRetries,
-    })
+    }),
+    {
+      model: defaults.model,
+    }
   )
 
   try {
diff --git a/scripts/konjacbot/translate.mts b/scripts/konjacbot/translate.mts
index 59dab35..4b27ff7 100644
--- a/scripts/konjacbot/translate.mts
+++ b/scripts/konjacbot/translate.mts
@@ -21,6 +21,8 @@ const defaults = {
   lang: 'ja',
   promptDir: path.join(import.meta.dirname, `prompt`),
   isCI: process.env.CI ?? false,
+  temperature: 0,
+  model: 'gpt-4o',
 } as const
 
 const log = createLogger(basename(import.meta.filename))
@@ -52,7 +54,11 @@ const command = await (async () => {
     new OpenAI({
       apiKey: defaults.apiKey,
       maxRetries: defaults.maxRetries,
-    })
+    }),
+    {
+      temperature: defaults.temperature,
+      model: defaults.model,
+    }
   )
 
   const systemContent = (
diff --git a/scripts/konjacbot/utils.mts b/scripts/konjacbot/utils.mts
index ae4fa24..7a3b7d6 100644
--- a/scripts/konjacbot/utils.mts
+++ b/scripts/konjacbot/utils.mts
@@ -240,7 +240,8 @@ export function createLogger(prefix: string) {
  * @returns {(prompt: { system: string; user: string }) => Promise<string>} A function that takes a prompt and returns the assistant's response as a string.
  */
 export function createOpenAIClient(
-  openai: OpenAI
+  openai: OpenAI,
+  options: Omit<OpenAI.ChatCompletionCreateParams, 'messages'>
 ): (prompt: { system: string; user: string }) => Promise<string> {
   async function fetch(prompt: {
     system: string
@@ -255,7 +256,7 @@ export function createOpenAIClient(
 
     while (!isComplete) {
       const response = await openai.chat.completions.create({
-        model: 'gpt-4o',
+        ...options,
         messages,
         stream: false,
       })