From 3686bcbd966ff1ef13e5fdbde28aa0e630ddd5c4 Mon Sep 17 00:00:00 2001
From: Shivangi Sharma <132820332+Shivangisharma4@users.noreply.github.com>
Date: Thu, 19 Feb 2026 05:00:02 +0530
Subject: [PATCH] fix(core): accept int temperature in _get_ls_params for
 LangSmith tracing (#35302)

---
 libs/core/langchain_core/language_models/chat_models.py    | 6 ++++--
 libs/core/langchain_core/language_models/llms.py           | 6 ++++--
 .../unit_tests/language_models/chat_models/test_base.py    | 7 +++++++
 .../tests/unit_tests/language_models/llms/test_base.py     | 7 +++++++
 4 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/libs/core/langchain_core/language_models/chat_models.py b/libs/core/langchain_core/language_models/chat_models.py
index 7e11c491d6f..32f198532e6 100644
--- a/libs/core/langchain_core/language_models/chat_models.py
+++ b/libs/core/langchain_core/language_models/chat_models.py
@@ -812,9 +812,11 @@ class BaseChatModel(BaseLanguageModel[AIMessage], ABC):
             ls_params["ls_model_name"] = self.model_name
 
         # temperature
-        if "temperature" in kwargs and isinstance(kwargs["temperature"], float):
+        if "temperature" in kwargs and isinstance(kwargs["temperature"], (int, float)):
             ls_params["ls_temperature"] = kwargs["temperature"]
-        elif hasattr(self, "temperature") and isinstance(self.temperature, float):
+        elif hasattr(self, "temperature") and isinstance(
+            self.temperature, (int, float)
+        ):
             ls_params["ls_temperature"] = self.temperature
 
         # max_tokens
diff --git a/libs/core/langchain_core/language_models/llms.py b/libs/core/langchain_core/language_models/llms.py
index 5aa287ada8e..fa034675d89 100644
--- a/libs/core/langchain_core/language_models/llms.py
+++ b/libs/core/langchain_core/language_models/llms.py
@@ -351,9 +351,11 @@ class BaseLLM(BaseLanguageModel[str], ABC):
             ls_params["ls_model_name"] = self.model_name
 
         # temperature
-        if "temperature" in kwargs and isinstance(kwargs["temperature"], float):
+        if "temperature" in kwargs and isinstance(kwargs["temperature"], (int, float)):
             ls_params["ls_temperature"] = kwargs["temperature"]
-        elif hasattr(self, "temperature") and isinstance(self.temperature, float):
+        elif hasattr(self, "temperature") and isinstance(
+            self.temperature, (int, float)
+        ):
             ls_params["ls_temperature"] = self.temperature
 
         # max_tokens
diff --git a/libs/core/tests/unit_tests/language_models/chat_models/test_base.py b/libs/core/tests/unit_tests/language_models/chat_models/test_base.py
index eedb5d393a8..5686b1a5b58 100644
--- a/libs/core/tests/unit_tests/language_models/chat_models/test_base.py
+++ b/libs/core/tests/unit_tests/language_models/chat_models/test_base.py
@@ -1206,6 +1206,13 @@ def test_get_ls_params() -> None:
     ls_params = llm._get_ls_params(temperature=0.2)
     assert ls_params["ls_temperature"] == 0.2
 
+    # Test integer temperature values (regression test for issue #35300)
+    ls_params = llm._get_ls_params(temperature=0)
+    assert ls_params["ls_temperature"] == 0
+
+    ls_params = llm._get_ls_params(temperature=1)
+    assert ls_params["ls_temperature"] == 1
+
     ls_params = llm._get_ls_params(max_tokens=2048)
     assert ls_params["ls_max_tokens"] == 2048
 
diff --git a/libs/core/tests/unit_tests/language_models/llms/test_base.py b/libs/core/tests/unit_tests/language_models/llms/test_base.py
index e5547a617a7..7ca52e43394 100644
--- a/libs/core/tests/unit_tests/language_models/llms/test_base.py
+++ b/libs/core/tests/unit_tests/language_models/llms/test_base.py
@@ -272,6 +272,13 @@ def test_get_ls_params() -> None:
     ls_params = llm._get_ls_params(temperature=0.2)
     assert ls_params["ls_temperature"] == 0.2
 
+    # Test integer temperature values (regression test for issue #35300)
+    ls_params = llm._get_ls_params(temperature=0)
+    assert ls_params["ls_temperature"] == 0
+
+    ls_params = llm._get_ls_params(temperature=1)
+    assert ls_params["ls_temperature"] == 1
+
     ls_params = llm._get_ls_params(max_tokens=2048)
     assert ls_params["ls_max_tokens"] == 2048