From 316d812ecb2b416d2d6b6cdcc492771a0c86b147 Mon Sep 17 00:00:00 2001 From: Mason Daugherty Date: Sun, 8 Feb 2026 23:28:10 -0500 Subject: [PATCH] feat(langchain): add provider inference metadata to `init_chat_model` --- .../langchain/chat_models/base.py | 44 +++++++++++++-- .../chat_models/test_chat_models.py | 56 ++++++++++++++++++- libs/langchain_v1/uv.lock | 13 ++--- 3 files changed, 97 insertions(+), 16 deletions(-) diff --git a/libs/langchain_v1/langchain/chat_models/base.py b/libs/langchain_v1/langchain/chat_models/base.py index 7148bd44b58..ebee422fb5e 100644 --- a/libs/langchain_v1/langchain/chat_models/base.py +++ b/libs/langchain_v1/langchain/chat_models/base.py @@ -322,6 +322,19 @@ def init_chat_model( chat model emulator that initializes the underlying model at runtime once a config is passed in. + When a concrete `BaseChatModel` is returned (non-configurable path), two + extra attributes are set on the instance: + + - `provider_was_inferred` (`bool`): `True` when the provider was guessed + from the model name rather than explicitly specified via the + `model_provider` kwarg or the `'provider:model'` prefix format. + - `resolved_provider` (`str`): The normalized provider string used to + look up the model class (e.g., `'openai'`). + + These attributes are **not** Pydantic fields — they won't appear in + `model_dump()` / `dict()` and won't survive `model_copy()`. Use + `getattr(model, 'provider_was_inferred', None)` for safe access. + Raises: ValueError: If `model_provider` cannot be inferred or isn't supported. ImportError: If the model provider integration package is not installed. @@ -471,9 +484,12 @@ def _init_chat_model_helper( model_provider: str | None = None, **kwargs: Any, ) -> BaseChatModel: - model, model_provider = _parse_model(model, model_provider) + model, model_provider, provider_inferred = _parse_model(model, model_provider) creator_func = _get_chat_model_creator(model_provider) - return creator_func(model=model, **kwargs) + chat_model = creator_func(model=model, **kwargs) + object.__setattr__(chat_model, "provider_was_inferred", provider_inferred) + object.__setattr__(chat_model, "resolved_provider", model_provider) + return chat_model def _attempt_infer_model_provider(model_name: str) -> str | None: @@ -543,8 +559,21 @@ def _attempt_infer_model_provider(model_name: str) -> str | None: return None -def _parse_model(model: str, model_provider: str | None) -> tuple[str, str]: - """Parse model name and provider, inferring provider if necessary.""" +def _parse_model(model: str, model_provider: str | None) -> tuple[str, str, bool]: + """Parse model name and provider, inferring provider if necessary. + + Args: + model: The model name, optionally with a provider prefix (e.g., `'openai:gpt-4o'`). + model_provider: Explicit provider name, or `None` to infer. + + Returns: + A 3-tuple of `(model_name, provider, provider_was_inferred)` where + `provider_was_inferred` is `True` only when the provider was + determined by `_attempt_infer_model_provider` (not from an explicit + kwarg or a colon-prefix format). + """ + provider_inferred = False + # Handle provider:model format if ( not model_provider @@ -555,7 +584,10 @@ def _parse_model(model: str, model_provider: str | None) -> tuple[str, str]: model = ":".join(model.split(":")[1:]) # Attempt to infer provider if not specified - model_provider = model_provider or _attempt_infer_model_provider(model) + if not model_provider: + model_provider = _attempt_infer_model_provider(model) + if model_provider: + provider_inferred = True if not model_provider: # Enhanced error message with suggestions @@ -571,7 +603,7 @@ def _parse_model(model: str, model_provider: str | None) -> tuple[str, str]: # Normalize provider name model_provider = model_provider.replace("-", "_").lower() - return model, model_provider + return model, model_provider, provider_inferred def _remove_prefix(s: str, prefix: str) -> str: diff --git a/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py b/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py index b2ac9345a8f..c067cd4f241 100644 --- a/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py +++ b/libs/langchain_v1/tests/unit_tests/chat_models/test_chat_models.py @@ -8,7 +8,11 @@ from langchain_core.runnables import RunnableConfig, RunnableSequence from pydantic import SecretStr from langchain.chat_models import __all__, init_chat_model -from langchain.chat_models.base import _SUPPORTED_PROVIDERS, _attempt_infer_model_provider +from langchain.chat_models.base import ( + _SUPPORTED_PROVIDERS, + _attempt_infer_model_provider, + _parse_model, +) if TYPE_CHECKING: from langchain_core.language_models import BaseChatModel @@ -335,3 +339,53 @@ def test_configurable_with_default() -> None: prompt = ChatPromptTemplate.from_messages([("system", "foo")]) chain = prompt | model_with_config assert isinstance(chain, RunnableSequence) + + +@pytest.mark.parametrize( + ("model", "provider", "expected_inferred"), + [ + # Explicit provider kwarg -> not inferred + ("gpt-4o", "openai", False), + # Colon-prefix format -> not inferred + ("openai:gpt-4o", None, False), + # Inferred from model name -> inferred + ("gpt-4o", None, True), + ("claude-sonnet-4-5-20250929", None, True), + ], +) +def test_parse_model_returns_inference_flag( + model: str, + provider: str | None, + expected_inferred: bool, # noqa: FBT001 +) -> None: + """Test that `_parse_model` tracks whether the provider was inferred.""" + _model, _provider, inferred = _parse_model(model, provider) + assert inferred is expected_inferred + assert _provider in {"openai", "anthropic"} + + +@pytest.mark.requires("langchain_openai") +@mock.patch.dict(os.environ, {"OPENAI_API_KEY": "foo"}, clear=True) +def test_provider_inference_metadata_inferred() -> None: + """When provider is inferred from model name, `provider_was_inferred` is True.""" + llm = init_chat_model("gpt-4o") + assert llm.provider_was_inferred is True # type: ignore[attr-defined] + assert llm.resolved_provider == "openai" # type: ignore[attr-defined] + + +@pytest.mark.requires("langchain_openai") +@mock.patch.dict(os.environ, {"OPENAI_API_KEY": "foo"}, clear=True) +def test_provider_inference_metadata_explicit() -> None: + """When provider is explicitly given, `provider_was_inferred` is False.""" + llm = init_chat_model("gpt-4o", model_provider="openai") + assert llm.provider_was_inferred is False # type: ignore[attr-defined] + assert llm.resolved_provider == "openai" # type: ignore[attr-defined] + + +@pytest.mark.requires("langchain_openai") +@mock.patch.dict(os.environ, {"OPENAI_API_KEY": "foo"}, clear=True) +def test_provider_inference_metadata_prefix_format() -> None: + """When provider is given via colon prefix, `provider_was_inferred` is False.""" + llm = init_chat_model("openai:gpt-4o") + assert llm.provider_was_inferred is False # type: ignore[attr-defined] + assert llm.resolved_provider == "openai" # type: ignore[attr-defined] diff --git a/libs/langchain_v1/uv.lock b/libs/langchain_v1/uv.lock index 54a3e356d91..c117a9ecbc5 100644 --- a/libs/langchain_v1/uv.lock +++ b/libs/langchain_v1/uv.lock @@ -1,5 +1,5 @@ version = 1 -revision = 2 +revision = 3 requires-python = ">=3.10.0, <4.0.0" resolution-markers = [ "python_full_version >= '3.14' and platform_python_implementation == 'PyPy'", @@ -1384,7 +1384,6 @@ wheels = [ { url = 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