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feat(vertexai): support model profiles #1374

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f2d59aa
support model profile
ccurme Nov 20, 2025
0dbed11
(temporary) install core from branch
ccurme Nov 20, 2025
2d8150c
fix tests
ccurme Nov 20, 2025
168258a
convert to auto-generated py file
ccurme Nov 21, 2025
a3f8543
make module private
ccurme Nov 21, 2025
25f5bec
update core dep and increment version
ccurme Nov 21, 2025
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24 changes: 24 additions & 0 deletions libs/vertexai/langchain_google_vertexai/chat_models.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
from functools import cached_property
import json
import logging
from pathlib import Path
import re
from operator import itemgetter
import uuid
Expand All @@ -35,6 +36,10 @@
generate_from_stream,
agenerate_from_stream,
)
from langchain_core.language_models.profile import ModelProfile, ModelProfileRegistry
from langchain_core.language_models.profile._loader_utils import (
load_profiles_from_data_dir,
)
from langchain_core.messages import (
AIMessage,
AIMessageChunk,
Expand Down Expand Up @@ -178,6 +183,17 @@
]


_MODEL_PROFILES = cast(
"ModelProfileRegistry",
load_profiles_from_data_dir(Path(__file__).parent / "data", "google-vertex"),
)


def _get_default_model_profile(model_name: str) -> ModelProfile:
default = _MODEL_PROFILES.get(model_name) or {}
return default.copy()


_FUNCTION_CALL_THOUGHT_SIGNATURES_MAP_KEY = (
"__gemini_function_call_thought_signatures__"
)
Expand Down Expand Up @@ -1867,6 +1883,14 @@ def validate_environment(self) -> Self:

return self

@model_validator(mode="after")
def _set_model_profile(self) -> Self:
"""Set model profile if not overridden."""
if self.profile is None:
model_id = re.sub(r"-\d{3}$", "", self.model_name.replace("models/", ""))
self.profile = _get_default_model_profile(model_id)
return self

def _prepare_params(
self,
stop: list[str] | None = None,
Expand Down
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