diff --git a/core/routes/civitai_search.py b/core/routes/civitai_search.py
index 6316eae..90a23cc 100644
--- a/core/routes/civitai_search.py
+++ b/core/routes/civitai_search.py
@@ -5,8 +5,10 @@ from .context import RouteContext
 from .helpers import register_service_route
 
 
-def register_civitai_search_routes(context: RouteContext):
-    model_service = ModelService(context)
+def register_civitai_search_routes(
+    context: RouteContext,
+    model_service: ModelService,
+):
     register_service_route(
         context,
         path="/model_resolver/civitai-search",
diff --git a/core/routes/custom_url.py b/core/routes/custom_url.py
index adbb1db..bfe8648 100644
--- a/core/routes/custom_url.py
+++ b/core/routes/custom_url.py
@@ -5,8 +5,10 @@ from .context import RouteContext
 from .helpers import register_service_route
 
 
-def register_custom_url_routes(context: RouteContext):
-    model_service = ModelService(context)
+def register_custom_url_routes(
+    context: RouteContext,
+    model_service: ModelService,
+):
     register_service_route(
         context,
         path="/model_resolver/custom-url",
diff --git a/core/routes/model_details.py b/core/routes/model_details.py
index b4fef3f..a590662 100644
--- a/core/routes/model_details.py
+++ b/core/routes/model_details.py
@@ -5,8 +5,10 @@ from .context import RouteContext
 from .helpers import register_service_route
 
 
-def register_model_details_routes(context: RouteContext):
-    model_service = ModelService(context)
+def register_model_details_routes(
+    context: RouteContext,
+    model_service: ModelService,
+):
     register_service_route(
         context,
         path="/model_resolver/model-details",
diff --git a/core/routes/registry.py b/core/routes/registry.py
index 1da67fa..73c3ed7 100644
--- a/core/routes/registry.py
+++ b/core/routes/registry.py
@@ -91,6 +91,7 @@ def register_routes(self):
                 search_local_matches_by_hash,
             )
             from ..scanner import find_local_file_path, get_model_files, invalidate_model_files_cache
+            from ..services.model_service import ModelService
             from ..settings import (
                 TEMPLATE_KEY_ALIASES,
                 get_default_root_for_category,
@@ -249,9 +250,10 @@ def register_routes(self):
         register_hash_routes(route_context)
         register_metadata_routes(route_context)
         register_loaded_model_routes(route_context)
-        register_civitai_search_routes(route_context)
-        register_custom_url_routes(route_context)
-        register_model_details_routes(route_context)
+        model_service = ModelService(route_context)
+        register_civitai_search_routes(route_context, model_service)
+        register_custom_url_routes(route_context, model_service)
+        register_model_details_routes(route_context, model_service)
 
         if download_available:
             register_source_search_routes(route_context)
diff --git a/tests/test_route_registry.py b/tests/test_route_registry.py
index e41e5ce..8084224 100644
--- a/tests/test_route_registry.py
+++ b/tests/test_route_registry.py
@@ -85,6 +85,31 @@ def test_register_routes_registers_each_route_family(route_environment):
     }.issubset(routes.registered)
 
 
+def test_register_routes_reuses_one_model_service_for_model_route_families(
+    monkeypatch,
+    route_environment,
+):
+    extension, _ = route_environment
+    constructors = []
+    service = SimpleNamespace(
+        civitai_search=MagicMock(),
+        custom_url=MagicMock(),
+        model_details=MagicMock(),
+    )
+
+    def build_service(context):
+        constructors.append(context)
+        return service
+
+    service_module = importlib.import_module(
+        f"{PACKAGE_NAME}.core.services.model_service"
+    )
+    monkeypatch.setattr(service_module, "ModelService", build_service)
+
+    assert registry_module.register_routes(extension) is True
+    assert len(constructors) == 1
+
+
 def test_register_routes_is_idempotent(route_environment):
     extension, routes = route_environment