diff --git a/module/zai/model.php b/module/zai/model.php
index da77a96075..27b35d6889 100644
--- a/module/zai/model.php
+++ b/module/zai/model.php
@@ -530,7 +530,7 @@ class zaiModel extends model
      * @param bool   $filterByPriv
      * @return array
      */
-    public function searchKnowledges(string $query, string $collection, array $filter, int $limit = 20, float $minSimilarity = 0.8, bool $filterByPriv = true): array
+    public function searchKnowledges(string $query, string $collection, array $filter, int $limit = 20, float $minSimilarity = 0.5, bool $filterByPriv = true): array
     {
         $postData = array();
         $postData['query']          = $query;
@@ -560,7 +560,7 @@ class zaiModel extends model
      * @param bool   $filterByPriv
      * @return array
      */
-    public function searchKnowledgeChunks(string $query, string $collection, array $filter = array(), int $limit = 20, float $minSimilarity = 0.8, bool $filterByPriv = true): array
+    public function searchKnowledgeChunks(string $query, string $collection, array $filter = array(), int $limit = 20, float $minSimilarity = 0.5, bool $filterByPriv = true): array
     {
         $postData = array();
         $postData['query']          = $query;
@@ -588,7 +588,7 @@ class zaiModel extends model
      * @param float  $minSimilarity
      * @return array
      */
-    public function searchKnowledgesInCollections(string $query, array $filters, string $type = 'content', int $limit = 20, float $minSimilarity = 0.8): array
+    public function searchKnowledgesInCollections(string $query, array $filters, string $type = 'content', int $limit = 20, float $minSimilarity = 0.5): array
     {
         $knowledges = array();
         foreach($filters as $collection => $setting)
diff --git a/module/zai/test/lib/zai.unittest.class.php b/module/zai/test/lib/zai.unittest.class.php
index ebb48c4e74..afe15e65ef 100644
--- a/module/zai/test/lib/zai.unittest.class.php
+++ b/module/zai/test/lib/zai.unittest.class.php
@@ -456,7 +456,7 @@ class zaiTest
      * @access public
      * @return array
      */
-    public function searchKnowledgesTest($query, $collection, $filter, $limit = 20, $minSimilarity = 0.8)
+    public function searchKnowledgesTest($query, $collection, $filter, $limit = 20, $minSimilarity = 0.5)
     {
         $result = $this->objectModel->searchKnowledges($query, $collection, $filter, $limit, $minSimilarity);
         return $result;
@@ -473,7 +473,7 @@ class zaiTest
      * @access public
      * @return array
      */
-    public function searchKnowledgeChunksTest($query, $collection, $filter, $limit = 20, $minSimilarity = 0.8)
+    public function searchKnowledgeChunksTest($query, $collection, $filter, $limit = 20, $minSimilarity = 0.5)
     {
         $result = $this->objectModel->searchKnowledgeChunks($query, $collection, $filter, $limit, $minSimilarity);
         return $result;
@@ -636,7 +636,7 @@ class zaiTest
      * @access public
      * @return array
      */
-    public function searchKnowledgesInCollectionsTest($query, $filters, $type = 'content', $limit = 20, $minSimilarity = 0.8)
+    public function searchKnowledgesInCollectionsTest($query, $filters, $type = 'content', $limit = 20, $minSimilarity = 0.5)
     {
         $result = $this->objectModel->searchKnowledgesInCollections($query, $filters, $type, $limit, $minSimilarity);
         return $result;