From b0f48043a1173b89788a228428532e128f19bf33 Mon Sep 17 00:00:00 2001
From: Odessit007 <igor.vustyanyuk@gmail.com>
Date: Sun, 16 Nov 2025 05:52:10 +0200
Subject: [PATCH 1/2] Support optional seed parameter in ChatGoogleGenerativeAI

---
 libs/genai/langchain_google_genai/_common.py     | 8 ++++++++
 libs/genai/langchain_google_genai/chat_models.py | 1 +
 libs/genai/langchain_google_genai/llms.py        | 1 +
 3 files changed, 10 insertions(+)

diff --git a/libs/genai/langchain_google_genai/_common.py b/libs/genai/langchain_google_genai/_common.py
index 3bffd24d9..ffe1495c1 100644
--- a/libs/genai/langchain_google_genai/_common.py
+++ b/libs/genai/langchain_google_genai/_common.py
@@ -210,6 +210,14 @@ class _BaseGoogleGenerativeAI(BaseModel):
             ```
     """  # noqa: E501
 
+    seed: int | None = Field(
+        default=None,
+    )
+    """
+    Optional. Seed used in decoding. If not set,
+     the request uses a randomly generated seed.
+    """
+
     @property
     def lc_secrets(self) -> dict[str, str]:
         # Either could contain the API key
diff --git a/libs/genai/langchain_google_genai/chat_models.py b/libs/genai/langchain_google_genai/chat_models.py
index 27b5032ce..48b4ca35f 100644
--- a/libs/genai/langchain_google_genai/chat_models.py
+++ b/libs/genai/langchain_google_genai/chat_models.py
@@ -2032,6 +2032,7 @@ def _prepare_params(
                     or self.include_thoughts is not None
                     else None
                 ),
+                "seed": self.seed,
             }.items()
             if v is not None
         }
diff --git a/libs/genai/langchain_google_genai/llms.py b/libs/genai/langchain_google_genai/llms.py
index 8647ef266..26e42bbdc 100644
--- a/libs/genai/langchain_google_genai/llms.py
+++ b/libs/genai/langchain_google_genai/llms.py
@@ -83,6 +83,7 @@ def validate_environment(self) -> Self:
             transport=self.transport,
             additional_headers=self.additional_headers,
             safety_settings=self.safety_settings,
+            seed=self.seed,
         )
 
         return self

From 7679b1d908a7c85ba88b0863ed66fb027b896921 Mon Sep 17 00:00:00 2001
From: Mason Daugherty <github@mdrxy.com>
Date: Tue, 18 Nov 2025 14:30:24 -0600
Subject: [PATCH 2/2] Apply suggestion from @mdrxy

---
 libs/genai/langchain_google_genai/_common.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libs/genai/langchain_google_genai/_common.py b/libs/genai/langchain_google_genai/_common.py
index ffe1495c1..ba1ba0944 100644
--- a/libs/genai/langchain_google_genai/_common.py
+++ b/libs/genai/langchain_google_genai/_common.py
@@ -214,8 +214,9 @@ class _BaseGoogleGenerativeAI(BaseModel):
         default=None,
     )
     """
-    Optional. Seed used in decoding. If not set,
-     the request uses a randomly generated seed.
+    Seed used in decoding.
+
+    If not set, the request uses a randomly generated seed.
     """
 
     @property