diff --git a/libs/core/langchain_core/utils/gateway.py b/libs/core/langchain_core/utils/gateway.py
index d6f833e0b54..3b3644a0ff6 100644
--- a/libs/core/langchain_core/utils/gateway.py
+++ b/libs/core/langchain_core/utils/gateway.py
@@ -1,15 +1,11 @@
 """Shared configuration for LangSmith Gateway provider endpoints."""
 
-from __future__ import annotations
-
 import os
-from typing import TYPE_CHECKING, Final, Literal, TypedDict
-
-if TYPE_CHECKING:
-    from collections.abc import Mapping
-
-    from typing_extensions import NotRequired
+from collections.abc import Mapping
+from typing import Final, Literal, TypedDict
+from urllib.parse import urlsplit, urlunsplit
 
+from typing_extensions import NotRequired
 
 GatewayProvider = Literal["anthropic", "fireworks", "google_genai", "openai"]
 
@@ -50,6 +46,16 @@ _DISABLED_GATEWAY_VALUES: Final = frozenset({"false", "0", "no"})
 _ENABLED_GATEWAY_VALUES: Final = frozenset({"true", "1", "yes"})
 
 
+def _append_gateway_provider_path(url: str, provider_path: str) -> str:
+    """Append a provider path without changing a URL's query or fragment."""
+    parsed_url = urlsplit(url)
+    if parsed_url.path.rstrip("/").endswith(provider_path):
+        return url
+    return urlunsplit(
+        parsed_url._replace(path=f"{parsed_url.path.rstrip('/')}{provider_path}")
+    )
+
+
 def resolve_langsmith_gateway_url(provider: GatewayProvider) -> str | None:
     """Resolve the configured LangSmith Gateway URL for a provider.
 
@@ -78,11 +84,6 @@ def resolve_langsmith_gateway_url(provider: GatewayProvider) -> str | None:
 
     provider_path = provider_config["path"]
     if raw_url.lower() not in _ENABLED_GATEWAY_VALUES:
-        if raw_url.rstrip("/").endswith(provider_path):
-            return raw_url
-        return f"{raw_url.rstrip('/')}{provider_path}"
+        return _append_gateway_provider_path(raw_url, provider_path)
 
-    gateway_url = LANGSMITH_GATEWAY_URL
-    if gateway_url.endswith(provider_path):
-        return gateway_url
-    return f"{gateway_url}{provider_path}"
+    return _append_gateway_provider_path(LANGSMITH_GATEWAY_URL, provider_path)
diff --git a/libs/core/tests/unit_tests/utils/test_gateway.py b/libs/core/tests/unit_tests/utils/test_gateway.py
index f4d9b3daba0..35127d0ba75 100644
--- a/libs/core/tests/unit_tests/utils/test_gateway.py
+++ b/libs/core/tests/unit_tests/utils/test_gateway.py
@@ -1,10 +1,13 @@
 """Tests for LangSmith Gateway URL configuration."""
 
+from typing import get_type_hints
+
 import pytest
 
 from langchain_core.utils.gateway import (
     LANGSMITH_GATEWAY_PROVIDERS,
     LANGSMITH_GATEWAY_URL,
+    GatewayProviderConfig,
     resolve_langsmith_gateway_url,
 )
 
@@ -93,3 +96,36 @@ def test_langsmith_gateway_provider_matrix() -> None:
         },
         "openai": {"path": "/openai/v1", "oauth": True, "static_key": True},
     }
+
+
+@pytest.mark.parametrize(
+    ("provider", "url", "expected_url"),
+    [
+        (
+            "openai",
+            "https://gateway.example.com?api-version=1#gateway",
+            "https://gateway.example.com/openai/v1?api-version=1#gateway",
+        ),
+        (
+            "openai",
+            "https://gateway.example.com/openai/v1?api-version=1#gateway",
+            "https://gateway.example.com/openai/v1?api-version=1#gateway",
+        ),
+    ],
+)
+def test_resolve_langsmith_gateway_url_preserves_query_and_fragment(
+    monkeypatch: pytest.MonkeyPatch,
+    provider: str,
+    url: str,
+    expected_url: str,
+) -> None:
+    """Provider paths are added before URL query and fragment components."""
+    monkeypatch.setenv("LANGSMITH_GATEWAY", url)
+
+    assert resolve_langsmith_gateway_url(provider) == expected_url  # type: ignore[arg-type]
+
+
+def test_gateway_provider_config_runtime_type_metadata() -> None:
+    """The public provider configuration retains optional-key metadata at runtime."""
+    assert GatewayProviderConfig.__optional_keys__ == {"notes"}
+    assert get_type_hints(GatewayProviderConfig)["notes"] is str
diff --git a/libs/partners/anthropic/pyproject.toml b/libs/partners/anthropic/pyproject.toml
index b4f170452b6..e00353d4b99 100644
--- a/libs/partners/anthropic/pyproject.toml
+++ b/libs/partners/anthropic/pyproject.toml
@@ -24,7 +24,7 @@ version = "1.4.8"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
     "anthropic>=0.96.0,<1.0.0",
-    "langchain-core>=1.4.7,<2.0.0",
+    "langchain-core>=1.4.10,<2.0.0",
     "pydantic>=2.7.4,<3.0.0",
 ]
 
diff --git a/libs/partners/anthropic/uv.lock b/libs/partners/anthropic/uv.lock
index 1e2d357d411..19268f6b51e 100644
--- a/libs/partners/anthropic/uv.lock
+++ b/libs/partners/anthropic/uv.lock
@@ -552,7 +552,7 @@ wheels = [
 
 [[package]]
 name = "langchain"
-version = "1.3.11"
+version = "1.3.12"
 source = { editable = "../../langchain_v1" }
 dependencies = [
     { name = "langchain-core" },
@@ -662,7 +662,7 @@ requires-dist = [
 ]
 
 [package.metadata.requires-dev]
-lint = [{ name = "ruff", specifier = ">=0.13.1,<0.14.0" }]
+lint = [{ name = "ruff", specifier = ">=0.13.1,<0.16.0" }]
 test = [
     { name = "blockbuster", specifier = ">=1.5.5,<1.6" },
     { name = "defusedxml", specifier = ">=0.7.1,<1.0.0" },
@@ -689,7 +689,7 @@ typing = [
 
 [[package]]
 name = "langchain-core"
-version = "1.4.8"
+version = "1.4.9"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/fireworks/pyproject.toml b/libs/partners/fireworks/pyproject.toml
index 7fffa830d5d..309fe5c5d13 100644
--- a/libs/partners/fireworks/pyproject.toml
+++ b/libs/partners/fireworks/pyproject.toml
@@ -23,7 +23,7 @@ classifiers = [
 version = "1.4.3"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
-    "langchain-core>=1.4.7,<2.0.0",
+    "langchain-core>=1.4.10,<2.0.0",
     "fireworks-ai>=1.2.0a71,<2.0.0",
     "openai>=2.0.0,<3.0.0",
     "requests>=2.0.0,<3.0.0",
diff --git a/libs/partners/fireworks/uv.lock b/libs/partners/fireworks/uv.lock
index b8dc8ad85da..0f6c2a8d1c4 100644
--- a/libs/partners/fireworks/uv.lock
+++ b/libs/partners/fireworks/uv.lock
@@ -737,7 +737,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.4.8"
+version = "1.4.9"
 source = { editable = "../../core" }
 dependencies = [
     { name = "jsonpatch" },
diff --git a/libs/partners/openai/pyproject.toml b/libs/partners/openai/pyproject.toml
index 0b85ed6f3ce..aa205681fea 100644
--- a/libs/partners/openai/pyproject.toml
+++ b/libs/partners/openai/pyproject.toml
@@ -23,7 +23,7 @@ classifiers = [
 version = "1.3.4"
 requires-python = ">=3.10.0,<4.0.0"
 dependencies = [
-    "langchain-core>=1.4.9,<2.0.0",
+    "langchain-core>=1.4.10,<2.0.0",
     "openai>=2.26.0,<3.0.0",
     "tiktoken>=0.7.0,<1.0.0",
 ]