diff --git a/main.py b/main.py
index 1c30d4e..4e3c6df 100644
--- a/main.py
+++ b/main.py
@@ -13,7 +13,7 @@ from fastapi import FastAPI, WebSocket, BackgroundTasks, Request, Form, WebSocke
 from fastapi.responses import RedirectResponse
 from fastapi.templating import Jinja2Templates
 from fastapi.staticfiles import StaticFiles
-from dotenv import load_dotenv
+from dotenv import load_dotenv, set_key
 
 # Lade Umgebungsvariablen aus der .env Datei
 load_dotenv()
@@ -27,7 +27,7 @@ SSH_KEY = os.path.expanduser("~/.ssh/id_rsa")
 DB_PATH = "cluster.db"
 chat_history = []
 PROMPT_FILE = "system_prompt.txt"
-
+ENV_FILE = os.path.join(os.path.dirname(__file__), ".env") # NEU
 # --- KI KONFIGURATION (Werte aus .env laden) ---
 AI_PROVIDER = os.getenv("AI_PROVIDER", "google").lower()
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY", "")
@@ -210,6 +210,40 @@ async def remove_node(node_id: int):
     conn.close()
     return RedirectResponse(url="/", status_code=303)
 
+@app.get("/api/settings")
+async def get_settings():
+    return {
+        "provider": AI_PROVIDER,
+        "google_model": GOOGLE_MODEL,
+        "openai_model": OPENAI_MODEL,
+        "ollama_model": OLLAMA_MODEL
+    }
+
+@app.post("/api/settings")
+async def update_settings(request: Request):
+    # Die globalen Variablen deklarieren, damit wir sie zur Laufzeit ändern können
+    global AI_PROVIDER, GOOGLE_MODEL, OPENAI_MODEL, OLLAMA_MODEL
+    
+    data = await request.json()
+    provider = data.get("provider")
+    model = data.get("model")
+    
+    if provider:
+        AI_PROVIDER = provider
+        set_key(ENV_FILE, "AI_PROVIDER", provider)
+        
+    if provider == "google" and model:
+        GOOGLE_MODEL = model
+        set_key(ENV_FILE, "GOOGLE_MODEL", model)
+    elif provider == "openai" and model:
+        OPENAI_MODEL = model
+        set_key(ENV_FILE, "OPENAI_MODEL", model)
+    elif provider == "ollama" and model:
+        OLLAMA_MODEL = model
+        set_key(ENV_FILE, "OLLAMA_MODEL", model)
+
+    return {"status": "success"}
+    
 # --- WebSockets ---
 
 @app.websocket("/ws/install_logs")