diff --git a/specs/openapi.json b/specs/openapi.json
index bfbaafe..44e11d7 100644
--- a/specs/openapi.json
+++ b/specs/openapi.json
@@ -6523,6 +6523,9 @@
                       },
                       {
                         "$ref": "#/components/schemas/ThreadResponse"
+                      },
+                      {
+                        "type": "null"
                       }
                     ]
                   }
diff --git a/specs/openapi_preview.json b/specs/openapi_preview.json
index ad44623..7b8f8f7 100644
--- a/specs/openapi_preview.json
+++ b/specs/openapi_preview.json
@@ -6523,6 +6523,9 @@
                       },
                       {
                         "$ref": "#/components/schemas/ThreadResponse"
+                      },
+                      {
+                        "type": "null"
                       }
                     ]
                   }