diff --git a/src/index.js b/src/index.js
index 9e87cb7..f418d41 100644
--- a/src/index.js
+++ b/src/index.js
@@ -10,7 +10,7 @@ const dataRoutes = require('./routes/data');
 const dbConfig = require('./config/database');
 
 const app = express();
-const PORT = process.env.PORT || 5000;
+const PORT = process.env.PORT || 5500;
 
 // Middleware
 app.use(cors());
diff --git a/src/routes/data/documentProcessing.js b/src/routes/data/documentProcessing.js
index 8c6c76d..66b0b30 100644
--- a/src/routes/data/documentProcessing.js
+++ b/src/routes/data/documentProcessing.js
@@ -178,7 +178,7 @@ router.post('/process-extraction', authenticateToken, async (req, res) => {
         const { kUmsatzBeleg, markDown } = umsatzResult.recordset[0];
         
         const response = await openai.responses.create({
-          model: "gpt-4o-mini",
+          model: "gpt-5-mini",
           input: [
             { "role": "developer", "content": [{ "type": "input_text", "text": `Extract specified information from provided input and structure it in a JSON format. 
 
@@ -228,7 +228,6 @@ router.post('/process-extraction', authenticateToken, async (req, res) => {
               }, "required": ["date", "invoice_number", "net_amounts_and_tax", "gross_amount", "currency", "country", "sender", "creditorID"], "additionalProperties": false }
             }
           },
-          reasoning: { "effort": "medium", "summary": "auto" },
           tools: [],
           store: false
         });
@@ -250,7 +249,7 @@ router.post('/process-extraction', authenticateToken, async (req, res) => {
         const { kPdfObjekt, markDown } = pdfResult.recordset[0];
         
         const response = await openai.responses.create({
-          model: "gpt-4o-mini",
+          model: "gpt-5-mini",
           input: [
             { "role": "developer", "content": [{ "type": "input_text", "text": `Extract specified information from provided input and structure it in a JSON format. 
 
@@ -300,7 +299,6 @@ router.post('/process-extraction', authenticateToken, async (req, res) => {
               }, "required": ["date", "invoice_number", "net_amounts_and_tax", "gross_amount", "currency", "country", "sender", "creditorID"], "additionalProperties": false }
             }
           },
-          reasoning: { "effort": "medium", "summary": "auto" },
           tools: [],
           store: false
         });
diff --git a/webpack.config.js b/webpack.config.js
index 5c1ecc1..ba5c1c5 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -75,7 +75,7 @@ module.exports = {
     },
     proxy: {
       '/api': {
-        target: 'http://localhost:5000',
+        target: 'http://localhost:5500',
         changeOrigin: true,
       },
     },
diff --git a/webpack.prod.config.js b/webpack.prod.config.js
index 36a58a5..7bc5bf9 100644
--- a/webpack.prod.config.js
+++ b/webpack.prod.config.js
@@ -85,7 +85,7 @@ module.exports = {
     },
     proxy: {
       '/api': {
-        target: 'http://localhost:5000',
+        target: 'http://localhost:5500',
         changeOrigin: true,
       },
     },
@@ -94,4 +94,4 @@ module.exports = {
     maxAssetSize: 512000,
     maxEntrypointSize: 512000,
   },
-}; 
\ No newline at end of file
+};