diff --git a/output/openapi/elasticsearch-openapi.json b/output/openapi/elasticsearch-openapi.json
index 1129e9883f..e457803db0 100644
--- a/output/openapi/elasticsearch-openapi.json
+++ b/output/openapi/elasticsearch-openapi.json
@@ -62936,10 +62936,17 @@
         ]
       },
       "_types.QueryVector": {
-        "type": "array",
-        "items": {
-          "type": "number"
-        }
+        "oneOf": [
+          {
+            "type": "array",
+            "items": {
+              "type": "number"
+            }
+          },
+          {
+            "type": "string"
+          }
+        ]
       },
       "_types.QueryVectorBuilder": {
         "type": "object",
diff --git a/output/openapi/elasticsearch-serverless-openapi.json b/output/openapi/elasticsearch-serverless-openapi.json
index b46ac50cfe..b7cbf19c0f 100644
--- a/output/openapi/elasticsearch-serverless-openapi.json
+++ b/output/openapi/elasticsearch-serverless-openapi.json
@@ -39189,10 +39189,17 @@
         ]
       },
       "_types.QueryVector": {
-        "type": "array",
-        "items": {
-          "type": "number"
-        }
+        "oneOf": [
+          {
+            "type": "array",
+            "items": {
+              "type": "number"
+            }
+          },
+          {
+            "type": "string"
+          }
+        ]
       },
       "_types.QueryVectorBuilder": {
         "type": "object",
diff --git a/output/schema/schema.json b/output/schema/schema.json
index dbffa0b55a..aad7dcb66f 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -54087,7 +54087,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L64-L87"
+      "specLocation": "_types/Knn.ts#L65-L88"
     },
     {
       "kind": "interface",
@@ -54346,7 +54346,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L35-L62"
+      "specLocation": "_types/Knn.ts#L36-L63"
     },
     {
       "kind": "interface",
@@ -55809,16 +55809,28 @@
         "name": "QueryVector",
         "namespace": "_types"
       },
-      "specLocation": "_types/Knn.ts#L25-L25",
+      "specLocation": "_types/Knn.ts#L26-L26",
       "type": {
-        "kind": "array_of",
-        "value": {
-          "kind": "instance_of",
-          "type": {
-            "name": "float",
-            "namespace": "_types"
+        "kind": "union_of",
+        "items": [
+          {
+            "kind": "array_of",
+            "value": {
+              "kind": "instance_of",
+              "type": {
+                "name": "float",
+                "namespace": "_types"
+              }
+            }
+          },
+          {
+            "kind": "instance_of",
+            "type": {
+              "name": "string",
+              "namespace": "_builtins"
+            }
           }
-        }
+        ]
       }
     },
     {
@@ -55840,7 +55852,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L89-L92",
+      "specLocation": "_types/Knn.ts#L90-L93",
       "variants": {
         "kind": "container"
       }
@@ -56277,7 +56289,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L30-L33"
+      "specLocation": "_types/Knn.ts#L31-L34"
     },
     {
       "kind": "interface",
@@ -58685,7 +58697,7 @@
           }
         }
       ],
-      "specLocation": "_types/Knn.ts#L94-L103"
+      "specLocation": "_types/Knn.ts#L95-L104"
     },
     {
       "kind": "interface",
diff --git a/output/typescript/types.ts b/output/typescript/types.ts
index a90a0dd993..4d99fef7cc 100644
--- a/output/typescript/types.ts
+++ b/output/typescript/types.ts
@@ -2715,7 +2715,7 @@ export interface QueryCacheStats {
   total_count: long
 }
 
-export type QueryVector = float[]
+export type QueryVector = float[] | string
 
 export interface QueryVectorBuilder {
   text_embedding?: TextEmbedding
diff --git a/specification/_types/Knn.ts b/specification/_types/Knn.ts
index f5fef4666a..bf1bcd03c5 100644
--- a/specification/_types/Knn.ts
+++ b/specification/_types/Knn.ts
@@ -22,7 +22,8 @@ import { float, integer } from '@_types/Numeric'
 import { InnerHits } from '@global/search/_types/hits'
 import { QueryBase, QueryContainer } from './query_dsl/abstractions'
 
-export type QueryVector = float[]
+/* Byte vectors can be hex-encoded strings */
+export type QueryVector = float[] | string
 
 /* KnnSearch (used in kNN search) and KnnQuery (ued in kNN queries) are close
  * but different enough to require different classes */