diff --git a/spec/openapi.yaml b/spec/openapi.yaml
index f6e39e7..3a1addf 100644
--- a/spec/openapi.yaml
+++ b/spec/openapi.yaml
@@ -6217,6 +6217,21 @@ components:
           example: "true"
         message_format:
           $ref: '#/components/schemas/format'
+        channels:
+          description: Filter the report by one or more message channels.
+          type: array
+          items:
+            type: string
+            enum:
+              - SMS
+              - MMS
+              - TTS
+              - RCS
+              - WHATSAPP
+              - CHANNEL
+          example:
+            - SMS
+            - WHATSAPP
         page:
           description: Page number for paging through paginated result sets.
           type: number
@@ -6387,16 +6402,16 @@ components:
       type: object
       properties:
         start_date:
-          description: Start date time for report window. By default, the timezone for this parameter will be taken from the account settings for the account associated with the credentials used to make the request, or the account included in the Account parameter. This can be overridden using the timezone parameter per request. The date must be in ISO8601 format.
+          description: Start date time for report window. By default, the timezone for this parameter will be taken from the account settings for the account associated with the credentials used to make the request, or the account included in the Account parameter. This can be overridden using the timezone parameter per request. The date must be in ISO8601 format and may include precise time values (e.g., milliseconds).
           type: string
-          example: "2022-12-12T00:00:00.000z"
+          example: "2022-12-12T01:01:01.001z"
         end_date:
           description: End date time for report window. By default, the timezone for this parameter
             will be taken from the account settings for the account associated with the
             credentials used to make the request, or the account included in the Account parameter.
-            This can be overridden using the timezone parameter per request. The date must be in ISO8601 format, and after the requested start_date.
+            This can be overridden using the timezone parameter per request. The date must be in ISO8601 format, and after the requested start_date and may include precise time values (e.g., milliseconds).
           type: string
-          example: "2022-12-14T00:00:00.000z"
+          example: "2022-12-14T01:01:01.001z"
         timezone:
           description: The timezone of the messages to include, using the name of the region.
           type: string
@@ -6443,11 +6458,27 @@ components:
           description: Filter the report to only include messages that triggered an opt-out
           type: string
           example: "true"
+        channels:
+          # TODO: Update docs on 16/Oct/2026 once 13 months of data are available.
+          description: Filter the report by one or more message channels. Supported from 14/Aug/2025, and filtering by channels is available only for reports starting from this date.
+          type: array
+          items:
+            type: string
+            enum:
+              - SMS
+              - MMS
+              - TTS
+              - RCS
+              - WHATSAPP
+              - CHANNEL
+          example:
+            - SMS
+            - WHATSAPP
         group_by:
           description: Group results by a list of values, from the enumerable table above.
           type: array
           items:
-            $ref: '#/components/schemas/GroupByField'
+            $ref: '#/components/schemas/GroupByInsightField'
           example:
             - WEEK
             - ACCOUNT
@@ -7403,6 +7434,21 @@ components:
       type: string
       description: The status of the message
       example: enroute
+    RichMessageType:
+      title: RichMessageType
+      type: string
+      # TODO: Update docs on 16/Oct/2026 once 13 months of data are available.
+      description: The type of rich message. Supported from 09/Sep/2025, and this data is available only for reports starting from this date.
+      enum:
+        - TEXT_MESSAGE
+        - MEDIA_MESSAGE
+        - LOCATION_MESSAGE
+        - CHOICE_RESPONSE_MESSAGE
+        - MEDIA_CARD_MESSAGE
+        - CARD_MESSAGE
+        - CAROUSEL_MESSAGE
+        - CHOICE_MESSAGE
+      example: TEXT_MESSAGE
     Message:
       title: Message
       required:
@@ -7548,6 +7594,8 @@ components:
           type: number
           description: The amount of messages received
           example: 1
+        message_type:
+          $ref: '#/components/schemas/RichMessageType'
         metadata:
           type: object
           description: >-
@@ -9499,6 +9547,24 @@ components:
         - STATUS
       type: string
       example: DAY
+    GroupByInsightField:
+      title: GroupByInsightField
+      # TODO: Update docs on 16/Oct/2026 once 13 months of data are available.
+      description: Defines available fields for grouping insights reports. COUNTRY and CHANNEL are supported from 14/Aug/2025, and POSTBACK_DATA is supported from 16/Sep/2025, with data for these available only from those dates onward.
+      enum:
+        - ACCOUNT
+        - DAY
+        - WEEK
+        - MONTH
+        - YEAR
+        - METADATA_KEY
+        - METADATA_VALUE
+        - STATUS
+        - COUNTRY
+        - CHANNEL
+        - POSTBACK_DATA
+      type: string
+      example: DAY
     CreateListRequest:
       required:
         - name