diff --git a/openapi.yaml b/openapi.yaml
index 622d3491..daec15aa 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -5601,7 +5601,7 @@ paths:
                         "end_time": 1730505600,
                         "results": [
                             {
-                                "object": "orgainzation.usage.audio_speeches.result",
+                                "object": "organization.usage.audio_speeches.result",
                                 "characters": 45,
                                 "num_model_requests": 1,
                                 "project_id": null,
@@ -12901,10 +12901,12 @@ components:
               description: Lowercase ISO-4217 currency e.g. "usd"
         line_item:
           type: string
+          nullable: true
           description: When `group_by=line_item`, this field provides the line item of the
             grouped costs result.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped costs result.
       required:
@@ -23206,18 +23208,22 @@ components:
           description: The count of requests made to the model.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
         user_id:
           type: string
+          nullable: true
           description: When `group_by=user_id`, this field provides the user ID of the
             grouped usage result.
         api_key_id:
           type: string
+          nullable: true
           description: When `group_by=api_key_id`, this field provides the API key ID of
             the grouped usage result.
         model:
           type: string
+          nullable: true
           description: When `group_by=model`, this field provides the model name of the
             grouped usage result.
       required:
@@ -23253,18 +23259,22 @@ components:
           description: The count of requests made to the model.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
         user_id:
           type: string
+          nullable: true
           description: When `group_by=user_id`, this field provides the user ID of the
             grouped usage result.
         api_key_id:
           type: string
+          nullable: true
           description: When `group_by=api_key_id`, this field provides the API key ID of
             the grouped usage result.
         model:
           type: string
+          nullable: true
           description: When `group_by=model`, this field provides the model name of the
             grouped usage result.
       required:
@@ -23297,6 +23307,7 @@ components:
           description: The number of code interpreter sessions.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
       required:
@@ -23320,35 +23331,43 @@ components:
             - organization.usage.completions.result
         input_tokens:
           type: integer
-          description: The number of input tokens used.
+          description: The aggregated number of input tokens used. For customers subscribe
+            to scale tier, this includes scale tier tokens.
         input_cached_tokens:
           type: integer
-          description: The number of input tokens that has been cached from previous
-            requests.
+          description: The aggregated number of input tokens that has been cached from
+            previous requests. For customers subscribe to scale tier, this
+            includes scale tier tokens.
         output_tokens:
           type: integer
-          description: The number of output tokens used.
+          description: The aggregated number of output tokens used. For customers
+            subscribe to scale tier, this includes scale tier tokens.
         num_model_requests:
           type: integer
           description: The count of requests made to the model.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
         user_id:
           type: string
+          nullable: true
           description: When `group_by=user_id`, this field provides the user ID of the
             grouped usage result.
         api_key_id:
           type: string
+          nullable: true
           description: When `group_by=api_key_id`, this field provides the API key ID of
             the grouped usage result.
         model:
           type: string
+          nullable: true
           description: When `group_by=model`, this field provides the model name of the
             grouped usage result.
         batch:
           type: boolean
+          nullable: true
           description: When `group_by=batch`, this field tells whether the grouped usage
             result is batch or not.
       required:
@@ -23381,24 +23400,28 @@ components:
             - organization.usage.embeddings.result
         input_tokens:
           type: integer
-          description: The number of input tokens used.
+          description: The aggregated number of input tokens used.
         num_model_requests:
           type: integer
           description: The count of requests made to the model.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
         user_id:
           type: string
+          nullable: true
           description: When `group_by=user_id`, this field provides the user ID of the
             grouped usage result.
         api_key_id:
           type: string
+          nullable: true
           description: When `group_by=api_key_id`, this field provides the API key ID of
             the grouped usage result.
         model:
           type: string
+          nullable: true
           description: When `group_by=model`, this field provides the model name of the
             grouped usage result.
       required:
@@ -23433,27 +23456,33 @@ components:
           description: The count of requests made to the model.
         source:
           type: string
+          nullable: true
           description: When `group_by=source`, this field provides the source of the
             grouped usage result, possible values are `image.generation`,
             `image.edit`, `image.variation`.
         size:
           type: string
+          nullable: true
           description: When `group_by=size`, this field provides the image size of the
             grouped usage result.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
         user_id:
           type: string
+          nullable: true
           description: When `group_by=user_id`, this field provides the user ID of the
             grouped usage result.
         api_key_id:
           type: string
+          nullable: true
           description: When `group_by=api_key_id`, this field provides the API key ID of
             the grouped usage result.
         model:
           type: string
+          nullable: true
           description: When `group_by=model`, this field provides the model name of the
             grouped usage result.
       required:
@@ -23484,24 +23513,28 @@ components:
             - organization.usage.moderations.result
         input_tokens:
           type: integer
-          description: The number of input tokens used.
+          description: The aggregated number of input tokens used.
         num_model_requests:
           type: integer
           description: The count of requests made to the model.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
         user_id:
           type: string
+          nullable: true
           description: When `group_by=user_id`, this field provides the user ID of the
             grouped usage result.
         api_key_id:
           type: string
+          nullable: true
           description: When `group_by=api_key_id`, this field provides the API key ID of
             the grouped usage result.
         model:
           type: string
+          nullable: true
           description: When `group_by=model`, this field provides the model name of the
             grouped usage result.
       required:
@@ -23582,6 +23615,7 @@ components:
           description: The vector stores usage in bytes.
         project_id:
           type: string
+          nullable: true
           description: When `group_by=project_id`, this field provides the project ID of
             the grouped usage result.
       required: