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feat(openrouter): add langchain-openrouter provider package (#35211)

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Add a first-party `langchain-openrouter` partner package
(`ChatOpenRouter`) that wraps the official `openrouter` Python SDK,
providing native support for OpenRouter-specific features that
`ChatOpenAI` intentionally does not handle.

Also adds scope-clarifying docstrings to `ChatOpenAI` / `BaseChatOpenAI`
warning users away from using `base_url` overrides with third-party
providers.

---

Closes #31325
Closes #32967
Closes #32977
Closes #32981
Closes #33643
Closes #33757
Closes #34056
Closes #34797
Closes #34962

Supersedes #33902, #34867 (thank you @elonfeng and @okamototk for your
initial work on this!)

---

Bugs with upstream sdk:
- https://github.com/OpenRouterTeam/python-sdk/issues/38
- https://github.com/OpenRouterTeam/python-sdk/issues/51
- https://github.com/OpenRouterTeam/python-sdk/issues/52
This commit is contained in:
Mason Daugherty
2026-02-15 02:09:13 -05:00
committed by GitHub
parent b97c629f9a
commit f9fd7be695
29 changed files with 8958 additions and 4 deletions
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65
libs/partners/openrouter/Makefile Normal file
View File

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.PHONY: all format lint type test tests integration_tests help extended_tests
# Default target executed when no arguments are given to make.
all: help
.EXPORT_ALL_VARIABLES:
UV_FROZEN = true
# Define a variable for the test file path.
TEST_FILE ?= tests/unit_tests/
integration_test integration_tests: TEST_FILE = tests/integration_tests/
# unit tests are run with the --disable-socket flag to prevent network calls
test tests:
uv run --group test pytest --disable-socket --allow-unix-socket $(TEST_FILE)
test_watch:
uv run --group test ptw --snapshot-update --now . -- -vv $(TEST_FILE)
# integration tests are run without the --disable-socket flag to allow network calls
integration_test integration_tests:
uv run --group test --group test_integration pytest --timeout=30 $(TEST_FILE)
######################
# LINTING AND FORMATTING
######################
# Define a variable for Python and notebook files.
PYTHON_FILES=.
MYPY_CACHE=.mypy_cache
lint format: PYTHON_FILES=.
lint_diff format_diff: PYTHON_FILES=$(shell git diff --relative=libs/partners/openrouter --name-only --diff-filter=d master | grep -E '\.py$$|\.ipynb$$')
lint_package: PYTHON_FILES=langchain_openrouter
lint_tests: PYTHON_FILES=tests
lint_tests: MYPY_CACHE=.mypy_cache_test
lint lint_diff lint_package lint_tests:
[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff check $(PYTHON_FILES)
[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff format $(PYTHON_FILES) --diff
[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) && uv run --all-groups mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
type:
mkdir -p $(MYPY_CACHE) && uv run --all-groups mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
format format_diff:
[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff format $(PYTHON_FILES)
[ "$(PYTHON_FILES)" = "" ] || uv run --all-groups ruff check --fix $(PYTHON_FILES)
check_imports: $(shell find langchain_openrouter -name '*.py')
uv run --all-groups python ./scripts/check_imports.py $^
######################
# HELP
######################
help:
@echo '----'
@echo 'check_imports - check imports'
@echo 'format - run code formatters'
@echo 'lint - run linters'
@echo 'type - run type checking'
@echo 'test - run unit tests'
@echo 'tests - run unit tests'
@echo 'test TEST_FILE=<test_file> - run all tests in file'