diff --git a/src/screens/ModelsScreen/utils.ts b/src/screens/ModelsScreen/utils.ts
index 226b7e48..40d5f815 100644
--- a/src/screens/ModelsScreen/utils.ts
+++ b/src/screens/ModelsScreen/utils.ts
@@ -71,7 +71,8 @@ export function getModelType(model: ModelInfo): ModelTypeFilter {
 export function isPhiModel(modelName: string, modelId: string): boolean {
   const name = modelName.toLowerCase();
   const id = modelId.toLowerCase();
-  return name.includes('phi') || id.includes('phi');
+  const phiPattern = /\bphi[-_]?\d/i;
+  return phiPattern.test(name) || phiPattern.test(id);
 }
 
 export function getTextModelCompatibility(
diff --git a/src/stores/appStore.ts b/src/stores/appStore.ts
index 396a4963..6f9cb345 100644
--- a/src/stores/appStore.ts
+++ b/src/stores/appStore.ts
@@ -135,7 +135,7 @@ const DEFAULT_SETTINGS: AppSettings = {
   cacheType: 'q8_0' as CacheType,
   showGenerationDetails: false,
   enabledTools: ['web_search', 'calculator', 'get_current_datetime', 'get_device_info', 'read_url', 'search_knowledge_base'],
-  thinkingEnabled: true,
+  thinkingEnabled: false,
 };
 
 function migrateEnabledTools(merged: any): void {