diff --git a/.generated-info b/.generated-info
index 2f609c52737..3a9f0a244ab 100644
--- a/.generated-info
+++ b/.generated-info
@@ -1,4 +1,4 @@
 {
-  "spec_repo_commit": "4413e63",
-  "generated": "2025-08-19 20:29:58.463"
+  "spec_repo_commit": "1211759",
+  "generated": "2025-08-21 16:45:54.489"
 }
diff --git a/.generator/schemas/v2/openapi.yaml b/.generator/schemas/v2/openapi.yaml
index 5dc52e4a2ee..3c4fa5920b3 100644
--- a/.generator/schemas/v2/openapi.yaml
+++ b/.generator/schemas/v2/openapi.yaml
@@ -50180,9 +50180,20 @@ paths:
         - cloud_cost_management_write
   /api/v2/cost_by_tag/active_billing_dimensions:
     get:
-      description: Get active billing dimensions for cost attribution. Cost data for
-        a given month becomes available no later than the 19th of the following month.
+      description: Get active billing dimensions for cost attribution in a given month.
+        Note that billing dimensions active in a given month may not appear in the
+        Monthly Cost Attribution API response until the 19th of the following month.
+        For the most accurate results, request the same month for both endpoints.
       operationId: GetActiveBillingDimensions
+      parameters:
+      - description: 'Datetime in ISO-8601 format, UTC, precise to month: [YYYY-MM]
+          for billing dimensions active this month. Defaults to the current month.'
+        in: query
+        name: month
+        required: false
+        schema:
+          format: date-time
+          type: string
       responses:
         '200':
           content:
diff --git a/src/main/java/com/datadog/api/client/v2/api/UsageMeteringApi.java b/src/main/java/com/datadog/api/client/v2/api/UsageMeteringApi.java
index c5b1b298dee..04fd00d359e 100644
--- a/src/main/java/com/datadog/api/client/v2/api/UsageMeteringApi.java
+++ b/src/main/java/com/datadog/api/client/v2/api/UsageMeteringApi.java
@@ -54,6 +54,23 @@ public void setApiClient(ApiClient apiClient) {
     this.apiClient = apiClient;
   }
 
+  /** Manage optional parameters to getActiveBillingDimensions. */
+  public static class GetActiveBillingDimensionsOptionalParameters {
+    private OffsetDateTime month;
+
+    /**
+     * Set month.
+     *
+     * @param month Datetime in ISO-8601 format, UTC, precise to month: [YYYY-MM] for billing
+     *     dimensions active this month. Defaults to the current month. (optional)
+     * @return GetActiveBillingDimensionsOptionalParameters
+     */
+    public GetActiveBillingDimensionsOptionalParameters month(OffsetDateTime month) {
+      this.month = month;
+      return this;
+    }
+  }
+
   /**
    * Get active billing dimensions for cost attribution.
    *
@@ -63,7 +80,9 @@ public void setApiClient(ApiClient apiClient) {
    * @throws ApiException if fails to make API call
    */
   public ActiveBillingDimensionsResponse getActiveBillingDimensions() throws ApiException {
-    return getActiveBillingDimensionsWithHttpInfo().getData();
+    return getActiveBillingDimensionsWithHttpInfo(
+            new GetActiveBillingDimensionsOptionalParameters())
+        .getData();
   }
 
   /**
@@ -74,7 +93,8 @@ public ActiveBillingDimensionsResponse getActiveBillingDimensions() throws ApiEx
    * @return CompletableFuture<ActiveBillingDimensionsResponse>
    */
   public CompletableFuture<ActiveBillingDimensionsResponse> getActiveBillingDimensionsAsync() {
-    return getActiveBillingDimensionsWithHttpInfoAsync()
+    return getActiveBillingDimensionsWithHttpInfoAsync(
+            new GetActiveBillingDimensionsOptionalParameters())
         .thenApply(
             response -> {
               return response.getData();
@@ -82,9 +102,43 @@ public CompletableFuture<ActiveBillingDimensionsResponse> getActiveBillingDimens
   }
 
   /**
-   * Get active billing dimensions for cost attribution. Cost data for a given month becomes
-   * available no later than the 19th of the following month.
+   * Get active billing dimensions for cost attribution.
+   *
+   * <p>See {@link #getActiveBillingDimensionsWithHttpInfo}.
+   *
+   * @param parameters Optional parameters for the request.
+   * @return ActiveBillingDimensionsResponse
+   * @throws ApiException if fails to make API call
+   */
+  public ActiveBillingDimensionsResponse getActiveBillingDimensions(
+      GetActiveBillingDimensionsOptionalParameters parameters) throws ApiException {
+    return getActiveBillingDimensionsWithHttpInfo(parameters).getData();
+  }
+
+  /**
+   * Get active billing dimensions for cost attribution.
    *
+   * <p>See {@link #getActiveBillingDimensionsWithHttpInfoAsync}.
+   *
+   * @param parameters Optional parameters for the request.
+   * @return CompletableFuture&lt;ActiveBillingDimensionsResponse&gt;
+   */
+  public CompletableFuture<ActiveBillingDimensionsResponse> getActiveBillingDimensionsAsync(
+      GetActiveBillingDimensionsOptionalParameters parameters) {
+    return getActiveBillingDimensionsWithHttpInfoAsync(parameters)
+        .thenApply(
+            response -> {
+              return response.getData();
+            });
+  }
+
+  /**
+   * Get active billing dimensions for cost attribution in a given month. Note that billing
+   * dimensions active in a given month may not appear in the Monthly Cost Attribution API response
+   * until the 19th of the following month. For the most accurate results, request the same month
+   * for both endpoints.
+   *
+   * @param parameters Optional parameters for the request.
    * @return ApiResponse&lt;ActiveBillingDimensionsResponse&gt;
    * @throws ApiException if fails to make API call
    * @http.response.details
@@ -97,19 +151,23 @@ public CompletableFuture<ActiveBillingDimensionsResponse> getActiveBillingDimens
    *       <tr><td> 429 </td><td> Too many requests </td><td>  -  </td></tr>
    *     </table>
    */
-  public ApiResponse<ActiveBillingDimensionsResponse> getActiveBillingDimensionsWithHttpInfo()
-      throws ApiException {
+  public ApiResponse<ActiveBillingDimensionsResponse> getActiveBillingDimensionsWithHttpInfo(
+      GetActiveBillingDimensionsOptionalParameters parameters) throws ApiException {
     Object localVarPostBody = null;
+    OffsetDateTime month = parameters.month;
     // create path and map variables
     String localVarPath = "/api/v2/cost_by_tag/active_billing_dimensions";
 
+    List<Pair> localVarQueryParams = new ArrayList<Pair>();
     Map<String, String> localVarHeaderParams = new HashMap<String, String>();
 
+    localVarQueryParams.addAll(apiClient.parameterToPairs("", "month", month));
+
     Invocation.Builder builder =
         apiClient.createBuilder(
             "v2.UsageMeteringApi.getActiveBillingDimensions",
             localVarPath,
-            new ArrayList<Pair>(),
+            localVarQueryParams,
             localVarHeaderParams,
             new HashMap<String, String>(),
             new String[] {"application/json;datetime-format=rfc3339"},
@@ -130,23 +188,29 @@ public ApiResponse<ActiveBillingDimensionsResponse> getActiveBillingDimensionsWi
    *
    * <p>See {@link #getActiveBillingDimensionsWithHttpInfo}.
    *
+   * @param parameters Optional parameters for the request.
    * @return CompletableFuture&lt;ApiResponse&lt;ActiveBillingDimensionsResponse&gt;&gt;
    */
   public CompletableFuture<ApiResponse<ActiveBillingDimensionsResponse>>
-      getActiveBillingDimensionsWithHttpInfoAsync() {
+      getActiveBillingDimensionsWithHttpInfoAsync(
+          GetActiveBillingDimensionsOptionalParameters parameters) {
     Object localVarPostBody = null;
+    OffsetDateTime month = parameters.month;
     // create path and map variables
     String localVarPath = "/api/v2/cost_by_tag/active_billing_dimensions";
 
+    List<Pair> localVarQueryParams = new ArrayList<Pair>();
     Map<String, String> localVarHeaderParams = new HashMap<String, String>();
 
+    localVarQueryParams.addAll(apiClient.parameterToPairs("", "month", month));
+
     Invocation.Builder builder;
     try {
       builder =
           apiClient.createBuilder(
               "v2.UsageMeteringApi.getActiveBillingDimensions",
               localVarPath,
-              new ArrayList<Pair>(),
+              localVarQueryParams,
               localVarHeaderParams,
               new HashMap<String, String>(),
               new String[] {"application/json;datetime-format=rfc3339"},