diff --git a/backend/app/main.py b/backend/app/main.py
index f54b79e..fc66fa0 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -1131,11 +1131,21 @@ def create_ai_configuration(
     # Desactivar configuraciones anteriores
     db.query(models.AIConfiguration).update({"is_active": False})
     
+    # Determinar modelo por defecto según el proveedor si no se especifica
+    model_name = config.model_name
+    if not model_name:
+        if config.provider == "openai":
+            model_name = "gpt-4o"
+        elif config.provider == "gemini":
+            model_name = "gemini-2.5-pro"
+        else:
+            model_name = "default"
+    
     # Crear nueva configuración
     new_config = models.AIConfiguration(
         provider=config.provider,
         api_key=config.api_key,
-        model_name=config.model_name,
+        model_name=model_name,
         is_active=True
     )
     
diff --git a/backend/app/models.py b/backend/app/models.py
index 808a607..8d5ad34 100644
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -180,7 +180,8 @@ class AIConfiguration(Base):
     id = Column(Integer, primary_key=True, index=True)
     provider = Column(String(50), nullable=False)  # openai, gemini
     api_key = Column(Text, nullable=False)
-    model_name = Column(String(100), nullable=False)
+    model_name = Column(String(100), nullable=True)
+    logo_url = Column(Text, nullable=True)  # URL del logo configurable
     is_active = Column(Boolean, default=True)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
diff --git a/backend/app/schemas.py b/backend/app/schemas.py
index 7693ad5..12b17bd 100644
--- a/backend/app/schemas.py
+++ b/backend/app/schemas.py
@@ -216,7 +216,7 @@ class InspectionDetail(Inspection):
 class AIConfigurationBase(BaseModel):
     provider: str  # openai, gemini
     api_key: str
-    model_name: str
+    model_name: Optional[str] = None
 
 class AIConfigurationCreate(AIConfigurationBase):
     pass