diff --git a/src/resources/chat/completions/completions.ts b/src/resources/chat/completions/completions.ts
index 05cae402e..c9eb83c7e 100644
--- a/src/resources/chat/completions/completions.ts
+++ b/src/resources/chat/completions/completions.ts
@@ -330,6 +330,16 @@ export interface ChatCompletion {
    */
   system_fingerprint?: string;
 
+  /**
+   * Set of 16 key-value pairs that can be attached to an object. This can be useful
+   * for storing additional information about the object in a structured format, and
+   * querying for objects via API or the dashboard.
+   *
+   * Keys are strings with a maximum length of 64 characters. Values are strings with
+   * a maximum length of 512 characters.
+   */
+  metadata?: Shared.Metadata | null;
+
   /**
    * Usage statistics for the completion request.
    */