diff --git a/.generator/schemas/v1/openapi.yaml b/.generator/schemas/v1/openapi.yaml
index 48f45d0bc2..10bb80eaa9 100644
--- a/.generator/schemas/v1/openapi.yaml
+++ b/.generator/schemas/v1/openapi.yaml
@@ -20015,7 +20015,8 @@ components:
           description: The account public ID.
           type: string
         billing_plan:
-          description: The billing plan.
+          deprecated: true
+          description: The billing plan (metadata). (Deprecated from May 2026)
           type: string
         end_date:
           description: Shows the last date of usage.
diff --git a/src/datadog_api_client/v1/model/usage_billable_summary_hour.py b/src/datadog_api_client/v1/model/usage_billable_summary_hour.py
index 5308ec4f27..917dc99eca 100644
--- a/src/datadog_api_client/v1/model/usage_billable_summary_hour.py
+++ b/src/datadog_api_client/v1/model/usage_billable_summary_hour.py
@@ -75,7 +75,7 @@ def __init__(
         :param account_public_id: The account public ID.
         :type account_public_id: str, optional
 
-        :param billing_plan: The billing plan.
+        :param billing_plan: The billing plan (metadata). (Deprecated from May 2026) **Deprecated**.
         :type billing_plan: str, optional
 
         :param end_date: Shows the last date of usage.