diff --git a/libs/community/langchain_community/chat_models/openai.py b/libs/community/langchain_community/chat_models/openai.py
index 54326d0acc288..cc320de50c3cb 100644
--- a/libs/community/langchain_community/chat_models/openai.py
+++ b/libs/community/langchain_community/chat_models/openai.py
@@ -5,6 +5,7 @@
 import logging
 import os
 import sys
+import warnings
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -146,6 +147,33 @@ def _convert_delta_to_message_chunk(
         return default_class(content=content)  # type: ignore[call-arg]
 
 
+def _update_token_usage(
+    overall_token_usage: Union[int, dict], new_usage: Union[int, dict]
+) -> Union[int, dict]:
+    # Token usage is either ints or dictionaries
+    # `reasoning_tokens` is nested inside `completion_tokens_details`
+    if isinstance(new_usage, int):
+        if not isinstance(overall_token_usage, int):
+            raise ValueError(
+                f"Got different types for token usage: "
+                f"{type(new_usage)} and {type(overall_token_usage)}"
+            )
+        return new_usage + overall_token_usage
+    elif isinstance(new_usage, dict):
+        if not isinstance(overall_token_usage, dict):
+            raise ValueError(
+                f"Got different types for token usage: "
+                f"{type(new_usage)} and {type(overall_token_usage)}"
+            )
+        return {
+            k: _update_token_usage(overall_token_usage.get(k, 0), v)
+            for k, v in new_usage.items()
+        }
+    else:
+        warnings.warn(f"Unexpected type for token usage: {type(new_usage)}")
+        return new_usage
+
+
 @deprecated(
     since="0.0.10", removal="1.0", alternative_import="langchain_openai.ChatOpenAI"
 )
@@ -374,7 +402,9 @@ def _combine_llm_outputs(self, llm_outputs: List[Optional[dict]]) -> dict:
             if token_usage is not None:
                 for k, v in token_usage.items():
                     if k in overall_token_usage:
-                        overall_token_usage[k] += v
+                        overall_token_usage[k] = _update_token_usage(
+                            overall_token_usage[k], v
+                        )
                     else:
                         overall_token_usage[k] = v
             if system_fingerprint is None:
diff --git a/libs/partners/openai/langchain_openai/chat_models/base.py b/libs/partners/openai/langchain_openai/chat_models/base.py
index b67bcafe60d53..61d9141df41ce 100644
--- a/libs/partners/openai/langchain_openai/chat_models/base.py
+++ b/libs/partners/openai/langchain_openai/chat_models/base.py
@@ -335,6 +335,33 @@ def _convert_chunk_to_generation_chunk(
     return generation_chunk
 
 
+def _update_token_usage(
+    overall_token_usage: Union[int, dict], new_usage: Union[int, dict]
+) -> Union[int, dict]:
+    # Token usage is either ints or dictionaries
+    # `reasoning_tokens` is nested inside `completion_tokens_details`
+    if isinstance(new_usage, int):
+        if not isinstance(overall_token_usage, int):
+            raise ValueError(
+                f"Got different types for token usage: "
+                f"{type(new_usage)} and {type(overall_token_usage)}"
+            )
+        return new_usage + overall_token_usage
+    elif isinstance(new_usage, dict):
+        if not isinstance(overall_token_usage, dict):
+            raise ValueError(
+                f"Got different types for token usage: "
+                f"{type(new_usage)} and {type(overall_token_usage)}"
+            )
+        return {
+            k: _update_token_usage(overall_token_usage.get(k, 0), v)
+            for k, v in new_usage.items()
+        }
+    else:
+        warnings.warn(f"Unexpected type for token usage: {type(new_usage)}")
+        return new_usage
+
+
 class _FunctionCall(TypedDict):
     name: str
 
@@ -561,7 +588,9 @@ def _combine_llm_outputs(self, llm_outputs: List[Optional[dict]]) -> dict:
             if token_usage is not None:
                 for k, v in token_usage.items():
                     if k in overall_token_usage:
-                        overall_token_usage[k] += v
+                        overall_token_usage[k] = _update_token_usage(
+                            overall_token_usage[k], v
+                        )
                     else:
                         overall_token_usage[k] = v
             if system_fingerprint is None:
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_azure_standard.ambr b/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_azure_standard.ambr
index 8233a605fda36..b2a33640aa874 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_azure_standard.ambr
+++ b/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_azure_standard.ambr
@@ -1,43 +1,6 @@
 # serializer version: 1
 # name: TestOpenAIStandard.test_serdes[serialized]
   dict({
-    'graph': dict({
-      'edges': list([
-        dict({
-          'source': 0,
-          'target': 1,
-        }),
-        dict({
-          'source': 1,
-          'target': 2,
-        }),
-      ]),
-      'nodes': list([
-        dict({
-          'data': 'AzureChatOpenAIInput',
-          'id': 0,
-          'type': 'schema',
-        }),
-        dict({
-          'data': dict({
-            'id': list([
-              'langchain',
-              'chat_models',
-              'azure_openai',
-              'AzureChatOpenAI',
-            ]),
-            'name': 'AzureChatOpenAI',
-          }),
-          'id': 1,
-          'type': 'runnable',
-        }),
-        dict({
-          'data': 'AzureChatOpenAIOutput',
-          'id': 2,
-          'type': 'schema',
-        }),
-      ]),
-    }),
     'id': list([
       'langchain',
       'chat_models',
diff --git a/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_base_standard.ambr b/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_base_standard.ambr
index 02e27256e5b45..dfcdefa88ac3e 100644
--- a/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_base_standard.ambr
+++ b/libs/partners/openai/tests/unit_tests/chat_models/__snapshots__/test_base_standard.ambr
@@ -1,43 +1,6 @@
 # serializer version: 1
 # name: TestOpenAIStandard.test_serdes[serialized]
   dict({
-    'graph': dict({
-      'edges': list([
-        dict({
-          'source': 0,
-          'target': 1,
-        }),
-        dict({
-          'source': 1,
-          'target': 2,
-        }),
-      ]),
-      'nodes': list([
-        dict({
-          'data': 'ChatOpenAIInput',
-          'id': 0,
-          'type': 'schema',
-        }),
-        dict({
-          'data': dict({
-            'id': list([
-              'langchain',
-              'chat_models',
-              'openai',
-              'ChatOpenAI',
-            ]),
-            'name': 'ChatOpenAI',
-          }),
-          'id': 1,
-          'type': 'runnable',
-        }),
-        dict({
-          'data': 'ChatOpenAIOutput',
-          'id': 2,
-          'type': 'schema',
-        }),
-      ]),
-    }),
     'id': list([
       'langchain',
       'chat_models',