diff --git a/.generator/schemas/v2/openapi.yaml b/.generator/schemas/v2/openapi.yaml
index fcf5fd48e2c3..ee9db84ef411 100644
--- a/.generator/schemas/v2/openapi.yaml
+++ b/.generator/schemas/v2/openapi.yaml
@@ -55239,7 +55239,6 @@ components:
           type: string
       required:
         - name
-        - project_id
       type: object
     LLMObsAnnotationQueueDataAttributesResponse:
       description: Attributes of an LLM Observability annotation queue.
@@ -158838,7 +158837,8 @@ paths:
         If you have any feedback, contact [Datadog support](https://docs.datadoghq.com/help/).
     post:
       description: |-
-        Create an annotation queue. The `name` and `project_id` fields are required.
+        Create an annotation queue. The `name` field is required.
+        Optionally associate the queue with a project by providing `project_id`.
         An optional `annotation_schema` can be provided to define the labels for the queue.
         Fields such as `created_by`, `owned_by`, `created_at`, `modified_by`,
         and `modified_at` are inferred by the backend.
diff --git a/lib/datadog_api_client/v2/api/llm_observability_api.rb b/lib/datadog_api_client/v2/api/llm_observability_api.rb
index c419cc5cb7b5..8cc562927027 100644
--- a/lib/datadog_api_client/v2/api/llm_observability_api.rb
+++ b/lib/datadog_api_client/v2/api/llm_observability_api.rb
@@ -275,7 +275,8 @@ def create_llm_obs_annotation_queue(body, opts = {})
 
     # Create an LLM Observability annotation queue.
     #
-    # Create an annotation queue. The `name` and `project_id` fields are required.
+    # Create an annotation queue. The `name` field is required.
+    # Optionally associate the queue with a project by providing `project_id`.
     # An optional `annotation_schema` can be provided to define the labels for the queue.
     # Fields such as `created_by`, `owned_by`, `created_at`, `modified_by`,
     # and `modified_at` are inferred by the backend.
diff --git a/lib/datadog_api_client/v2/models/llm_obs_annotation_queue_data_attributes_request.rb b/lib/datadog_api_client/v2/models/llm_obs_annotation_queue_data_attributes_request.rb
index 4a71521ca893..9f5a134e169e 100644
--- a/lib/datadog_api_client/v2/models/llm_obs_annotation_queue_data_attributes_request.rb
+++ b/lib/datadog_api_client/v2/models/llm_obs_annotation_queue_data_attributes_request.rb
@@ -31,7 +31,7 @@ class LLMObsAnnotationQueueDataAttributesRequest
     attr_reader :name
 
     # Identifier of the project this queue belongs to.
-    attr_reader :project_id
+    attr_accessor :project_id
 
     attr_accessor :additional_properties
 
@@ -97,7 +97,6 @@ def initialize(attributes = {})
     # @!visibility private
     def valid?
       return false if @name.nil?
-      return false if @project_id.nil?
       true
     end
 
@@ -111,16 +110,6 @@ def name=(name)
       @name = name
     end
 
-    # Custom attribute writer method with validation
-    # @param project_id [Object] Object to be assigned
-    # @!visibility private
-    def project_id=(project_id)
-      if project_id.nil?
-        fail ArgumentError, 'invalid value for "project_id", project_id cannot be nil.'
-      end
-      @project_id = project_id
-    end
-
     # Returns the object in the form of hash, with additionalProperties support.
     # @return [Hash] Returns the object in the form of hash
     # @!visibility private