diff --git a/openapi/azure.openai.chat/openapi.yaml b/openapi/azure.openai.chat/openapi.yaml
index 6aace7f58..d29dbc83e 100644
--- a/openapi/azure.openai.chat/openapi.yaml
+++ b/openapi/azure.openai.chat/openapi.yaml
@@ -910,6 +910,7 @@ components:
         system_fingerprint:
           type: string
           description: Can be used in conjunction with the `seed` request parameter to understand when backend changes have been made that might impact determinism.
+          nullable: true
       required:
         - id
         - object
diff --git a/openapi/azure.openai.chat/types.bal b/openapi/azure.openai.chat/types.bal
index b3c53895b..a7df2ea10 100644
--- a/openapi/azure.openai.chat/types.bal
+++ b/openapi/azure.openai.chat/types.bal
@@ -384,7 +384,7 @@ public type ChatCompletionsResponseCommon record {
     # Usage statistics for the completion request.
     CompletionUsage usage?;
     # Can be used in conjunction with the `seed` request parameter to understand when backend changes have been made that might impact determinism.
-    string system_fingerprint?;
+    string? system_fingerprint?;
 };
 
 # Error response object.
diff --git a/openapi/openai.chat/openapi.yaml b/openapi/openai.chat/openapi.yaml
index 1c2c0e85b..f827ae085 100644
--- a/openapi/openai.chat/openapi.yaml
+++ b/openapi/openai.chat/openapi.yaml
@@ -793,7 +793,6 @@ components:
           $ref: '#/components/schemas/ChatCompletionMessageToolCalls'
         function_call:
           type: object
-          deprecated: true
           description: Deprecated and replaced by `tool_calls`. The name and arguments of a function that should be called, as generated by the model.
           properties:
             arguments:
@@ -829,7 +828,6 @@ components:
     ChatCompletionRequestFunctionMessage:
       type: object
       title: Function message
-      deprecated: true
       properties:
         role:
           type: string
@@ -856,7 +854,6 @@ components:
       additionalProperties: true
     ChatCompletionFunctions:
       type: object
-      deprecated: true
       properties:
         description:
           type: string
@@ -1001,7 +998,6 @@ components:
           description: The role of the author of this message.
         function_call:
           type: object
-          deprecated: true
           description: Deprecated and replaced by `tool_calls`. The name and arguments of a function that should be called, as generated by the model.
           properties:
             arguments:
@@ -1186,7 +1182,6 @@ components:
           description: |
             A unique identifier representing your end-user, which can help OpenAI to monitor and detect abuse. [Learn more](/docs/guides/safety-best-practices/end-user-ids).
         function_call:
-          deprecated: true
           description: |
             Deprecated in favor of `tool_choice`.
 
@@ -1206,7 +1201,6 @@ components:
             - $ref: '#/components/schemas/ChatCompletionFunctionCallOption'
           x-oaiExpandable: true
         functions:
-          deprecated: true
           description: |
             Deprecated in favor of `tools`.
 
@@ -1279,6 +1273,7 @@ components:
             This fingerprint represents the backend configuration that the model runs with.
 
             Can be used in conjunction with the `seed` request parameter to understand when backend changes have been made that might impact determinism.
+          nullable: true
         object:
           type: string
           description: The object type, which is always `chat.completion`.
diff --git a/openapi/openai.chat/types.bal b/openapi/openai.chat/types.bal
index 704a984bb..6974169be 100644
--- a/openapi/openai.chat/types.bal
+++ b/openapi/openai.chat/types.bal
@@ -83,9 +83,6 @@ public type ChatCompletionNamedToolChoice record {
 };
 
 # Deprecated and replaced by `tool_calls`. The name and arguments of a function that should be called, as generated by the model.
-#
-# # Deprecated
-@deprecated
 public type ChatCompletionRequestAssistantMessage_function_call record {
     # The arguments to call the function with, as generated by the model in JSON format. Note that the model does not always generate valid JSON, and may hallucinate parameters not defined by your function schema. Validate the arguments in your code before calling your function.
     string arguments;
@@ -286,14 +283,13 @@ public type CreateChatCompletionResponse record {
     # This fingerprint represents the backend configuration that the model runs with.
     #
     # Can be used in conjunction with the `seed` request parameter to understand when backend changes have been made that might impact determinism.
-    string system_fingerprint?;
+    string? system_fingerprint?;
     # The object type, which is always `chat.completion`.
     "chat.completion" 'object;
     # Usage statistics for the completion request.
     CompletionUsage usage?;
 };
 
-@deprecated
 public type ChatCompletionRequestFunctionMessage record {
     # The role of the messages author, in this case `function`.
     "function" role;
@@ -318,7 +314,6 @@ public type ChatCompletionRequestToolMessage record {
     string tool_call_id;
 };
 
-@deprecated
 public type ChatCompletionFunctions record {
     # A description of what the function does, used by the model to choose when and how to call the function.
     string description?;