diff --git a/src/app/(dashboard)/dashboard/providers/[id]/page.tsx b/src/app/(dashboard)/dashboard/providers/[id]/page.tsx
index 50b9ca84b1..284d319e44 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/page.tsx
+++ b/src/app/(dashboard)/dashboard/providers/[id]/page.tsx
@@ -2735,10 +2735,7 @@ export default function ProviderDetailPage() {
         notify.error(detail || t("failedSaveCustomModel"));
         return;
       }
-      await Promise.all([
-        fetchProviderModelMeta().catch(() => {}),
-        fetchAliases().catch(() => {}),
-      ]);
+      await Promise.all([fetchProviderModelMeta().catch(() => {}), fetchAliases().catch(() => {})]);
     } catch {
       notify.error(t("failedSaveCustomModel"));
     } finally {
@@ -2764,10 +2761,7 @@ export default function ProviderDetailPage() {
         notify.error(detail || t("failedSaveCustomModel"));
         return;
       }
-      await Promise.all([
-        fetchProviderModelMeta().catch(() => {}),
-        fetchAliases().catch(() => {}),
-      ]);
+      await Promise.all([fetchProviderModelMeta().catch(() => {}), fetchAliases().catch(() => {})]);
     } catch {
       notify.error(t("failedSaveCustomModel"));
     } finally {
@@ -4281,7 +4275,14 @@ function PassthroughModelsSection({
     }
 
     return rows;
-  }, [availableModels, customModelMap, customModels, isModelHidden, providerAlias, providerAliases]);
+  }, [
+    availableModels,
+    customModelMap,
+    customModels,
+    isModelHidden,
+    providerAlias,
+    providerAliases,
+  ]);
   const filteredModels = allModels.filter((model) =>
     matchesModelCatalogQuery(modelFilter, {
       modelId: model.modelId,
@@ -4380,7 +4381,7 @@ function PassthroughModelsSection({
               isHidden={isHidden}
               copied={copied}
               onCopy={onCopy}
-              onDeleteAlias={alias ? () => onDeleteAlias(alias) : undefined}
+              onDeleteAlias={source === "alias" && alias ? () => onDeleteAlias(alias) : undefined}
               t={t}
               showDeveloperToggle
               effectiveModelNormalize={effectiveModelNormalize}
@@ -5350,7 +5351,13 @@ function CompatibleModelsSection({
               isHidden={isHidden}
               copied={copied}
               onCopy={onCopy}
-              onDeleteAlias={() => handleDeleteModel(modelId, alias)}
+              onDeleteAlias={
+                source === "custom" || source === "manual"
+                  ? () => handleDeleteModel(modelId, alias)
+                  : source === "alias" && alias
+                    ? () => onDeleteAlias(alias)
+                    : undefined
+              }
               t={t}
               showDeveloperToggle={!isAnthropic}
               effectiveModelNormalize={effectiveModelNormalize}
diff --git a/src/app/api/provider-models/route.ts b/src/app/api/provider-models/route.ts
index 40c81a687b..4956aaf962 100644
--- a/src/app/api/provider-models/route.ts
+++ b/src/app/api/provider-models/route.ts
@@ -4,6 +4,7 @@ import {
   addCustomModel,
   removeCustomModel,
   replaceCustomModels,
+  deleteSyncedAvailableModelsForProvider,
   updateCustomModel,
   getModelCompatOverrides,
   mergeModelCompatOverride,
@@ -369,9 +370,12 @@ export async function DELETE(request) {
     const all = searchParams.get("all");
     if (all === "true") {
       await replaceCustomModels(provider, [], { allowEmpty: true });
+      const syncedAvailableModelListsRemoved =
+        await deleteSyncedAvailableModelsForProvider(provider);
       const removedAliases = await deleteManagedAvailableModelAliasesForProvider(provider);
       return Response.json({
         cleared: true,
+        syncedAvailableModelListsRemoved,
         aliasChanges: { removed: removedAliases, assigned: [] },
       });
     }
diff --git a/src/lib/db/models.ts b/src/lib/db/models.ts
index f749a4ffc8..2520ada8fa 100644
--- a/src/lib/db/models.ts
+++ b/src/lib/db/models.ts
@@ -707,6 +707,22 @@ export async function deleteSyncedAvailableModelsForConnection(
   return getSyncedAvailableModels(providerId);
 }
 
+/**
+ * Delete all synced models for every connection belonging to a provider.
+ * Returns the number of connection-scoped synced model lists removed.
+ */
+export async function deleteSyncedAvailableModelsForProvider(providerId: string): Promise<number> {
+  const db = getDbInstance();
+  const keyPrefix = `${providerId}:`;
+  const result = db
+    .prepare(
+      "DELETE FROM key_value WHERE namespace = 'syncedAvailableModels' AND substr(key, 1, ?) = ?"
+    )
+    .run(keyPrefix.length, keyPrefix);
+  backupDbFile("pre-write");
+  return Number(result.changes || 0);
+}
+
 export async function updateCustomModel(
   providerId: string,
   modelId: string,
diff --git a/src/lib/localDb.ts b/src/lib/localDb.ts
index f3af94bc83..65a5681e08 100755
--- a/src/lib/localDb.ts
+++ b/src/lib/localDb.ts
@@ -65,6 +65,7 @@ export {
   getAllSyncedAvailableModels,
   replaceSyncedAvailableModelsForConnection,
   deleteSyncedAvailableModelsForConnection,
+  deleteSyncedAvailableModelsForProvider,
 } from "./db/models";
 
 export type { ModelCompatPerProtocol, ModelCompatPatch, SyncedAvailableModel } from "./db/models";
diff --git a/tests/unit/managed-model-import.test.ts b/tests/unit/managed-model-import.test.ts
index 84be9ff37c..0a09fe12ff 100644
--- a/tests/unit/managed-model-import.test.ts
+++ b/tests/unit/managed-model-import.test.ts
@@ -64,3 +64,23 @@ test("merge mode builds aliases from discovered models without pruning missing p
   assert.equal(aliases["model-a"], undefined);
   assert.equal(aliases["model-b"], "openrouter/shared/model-b");
 });
+
+test("provider-level synced model deletion removes only that provider", async () => {
+  await modelsDb.replaceSyncedAvailableModelsForConnection("openrouter", "conn-a", [
+    { id: "shared/model-a", name: "Model A", source: "imported" },
+  ]);
+  await modelsDb.replaceSyncedAvailableModelsForConnection("openrouter", "conn-b", [
+    { id: "shared/model-b", name: "Model B", source: "imported" },
+  ]);
+  await modelsDb.replaceSyncedAvailableModelsForConnection("openai", "conn-a", [
+    { id: "shared/model-c", name: "Model C", source: "imported" },
+  ]);
+
+  const removed = await modelsDb.deleteSyncedAvailableModelsForProvider("openrouter");
+
+  assert.equal(removed, 2);
+  assert.deepEqual(await modelsDb.getSyncedAvailableModels("openrouter"), []);
+  assert.deepEqual(await modelsDb.getSyncedAvailableModels("openai"), [
+    { id: "shared/model-c", name: "Model C", source: "imported" },
+  ]);
+});