diff --git a/common/api-review/ai.api.md b/common/api-review/ai.api.md
index d096d4c27f6..d24e24e636e 100644
--- a/common/api-review/ai.api.md
+++ b/common/api-review/ai.api.md
@@ -518,7 +518,8 @@ export enum HarmBlockThreshold {
     BLOCK_LOW_AND_ABOVE = "BLOCK_LOW_AND_ABOVE",
     BLOCK_MEDIUM_AND_ABOVE = "BLOCK_MEDIUM_AND_ABOVE",
     BLOCK_NONE = "BLOCK_NONE",
-    BLOCK_ONLY_HIGH = "BLOCK_ONLY_HIGH"
+    BLOCK_ONLY_HIGH = "BLOCK_ONLY_HIGH",
+    OFF = "OFF"
 }
 
 // @public
diff --git a/docs-devsite/ai.md b/docs-devsite/ai.md
index c43c0391ba4..a8e6db38a8d 100644
--- a/docs-devsite/ai.md
+++ b/docs-devsite/ai.md
@@ -551,6 +551,7 @@ export declare enum HarmBlockThreshold
 |  BLOCK\_MEDIUM\_AND\_ABOVE | <code>&quot;BLOCK_MEDIUM_AND_ABOVE&quot;</code> | Content with <code>NEGLIGIBLE</code> and <code>LOW</code> will be allowed. |
 |  BLOCK\_NONE | <code>&quot;BLOCK_NONE&quot;</code> | All content will be allowed. |
 |  BLOCK\_ONLY\_HIGH | <code>&quot;BLOCK_ONLY_HIGH&quot;</code> | Content with <code>NEGLIGIBLE</code>, <code>LOW</code>, and <code>MEDIUM</code> will be allowed. |
+|  OFF | <code>&quot;OFF&quot;</code> | All content will be allowed. This is the same as <code>BLOCK_NONE</code>, but the metadata corresponding to the [HarmCategory](./ai.md#harmcategory) will not be present in the response. |
 
 ## HarmCategory
 
diff --git a/packages/ai/src/types/enums.ts b/packages/ai/src/types/enums.ts
index 5c6612ce26a..47d654bbcd1 100644
--- a/packages/ai/src/types/enums.ts
+++ b/packages/ai/src/types/enums.ts
@@ -58,7 +58,12 @@ export enum HarmBlockThreshold {
   /**
    * All content will be allowed.
    */
-  BLOCK_NONE = 'BLOCK_NONE'
+  BLOCK_NONE = 'BLOCK_NONE',
+  /**
+   * All content will be allowed. This is the same as `BLOCK_NONE`, but the metadata corresponding
+   * to the {@link HarmCategory} will not be present in the response.
+   */
+  OFF = 'OFF'
 }
 
 /**