From e94cd41fee933a317c79c6145ab6b68aab3db20a Mon Sep 17 00:00:00 2001
From: Mason Daugherty <mason@langchain.dev>
Date: Fri, 3 Apr 2026 18:46:58 -0400
Subject: [PATCH] feat(core): add `ChatBaseten` to serializable mapping
 (#36510)

Register `ChatBaseten` from `langchain_baseten` in the core
serialization mapping so it can round-trip through `loads`/`dumps`.
Without this entry, serialized `ChatBaseten` objects fail to
deserialize.
---
 libs/core/langchain_core/load/mapping.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/core/langchain_core/load/mapping.py b/libs/core/langchain_core/load/mapping.py
index c5a2708dbc1..a2d67e3e3d1 100644
--- a/libs/core/langchain_core/load/mapping.py
+++ b/libs/core/langchain_core/load/mapping.py
@@ -283,6 +283,11 @@ SERIALIZABLE_MAPPING: dict[tuple[str, ...], tuple[str, ...]] = {
         "chat_models",
         "ChatXAI",
     ),
+    ("langchain_baseten", "chat_models", "ChatBaseten"): (
+        "langchain_baseten",
+        "chat_models",
+        "ChatBaseten",
+    ),
     ("langchain", "chat_models", "fireworks", "ChatFireworks"): (
         "langchain_fireworks",
         "chat_models",