diff --git a/generate-category-descriptions.js b/generate-category-descriptions.js
index 1512f55..b300bde 100644
--- a/generate-category-descriptions.js
+++ b/generate-category-descriptions.js
@@ -10,7 +10,7 @@ const DIST_DIR = './dist';
 const OUTPUT_CSV = './category-descriptions.csv';
 
 // Model configuration
-const MODEL = 'gpt-5.1';
+const MODEL = 'gpt-5.4';
 
 // Initialize OpenAI client
 const openai = new OpenAI({
@@ -149,7 +149,7 @@ async function generateSEODescription(productListContent, categoryName, category
         }
 
         const response = await openai.responses.create({
-            model: "gpt-5.1",
+            model: "gpt-5.4",
             input: [
                 {
                     "role": "developer",
diff --git a/translate-i18n.js b/translate-i18n.js
index f1d0ca8..80e9c58 100755
--- a/translate-i18n.js
+++ b/translate-i18n.js
@@ -54,7 +54,7 @@ const LEGAL_FILES = [
 ];
 
 // Model configuration
-const GERMAN_TO_ENGLISH_MODEL = 'gpt-5.1'; // High-quality model for German -> English (critical step)
+const GERMAN_TO_ENGLISH_MODEL = 'gpt-5.4'; // High-quality model for German -> English (critical step)
 const ENGLISH_TO_OTHER_MODEL = 'gpt-4.1-mini'; // Faster/cheaper model for English -> Other languages
 
 // Supported languages for translation
@@ -356,7 +356,7 @@ function writeTranslationFile(filePath, translationString) {
 }
 
 // Function to translate content using OpenAI (for German to English)
-async function translateContent(content, systemPrompt, targetLanguage = null, model = 'gpt-5.1') {
+async function translateContent(content, systemPrompt, targetLanguage = null, model = 'gpt-5.4') {
   try {
     const prompt = targetLanguage 
       ? systemPrompt.replace(/{{targetLanguage}}/g, targetLanguage)
@@ -379,7 +379,7 @@ async function translateContent(content, systemPrompt, targetLanguage = null, mo
 }
 
 // Function to translate English to other languages (optimized for caching)
-async function translateToTargetLanguage(englishContent, targetLanguage, model = 'gpt-4o-mini', isLegalFile = false) {
+async function translateToTargetLanguage(englishContent, targetLanguage, model = 'gpt-4.1-mini', isLegalFile = false) {
   try {
     // Choose appropriate system prompt based on file type
     const promptTemplate = isLegalFile