Registry / llm-agents / langchain-openrouter

langchain-openrouter

library0.2.3pypypi✓ verified 80d ago

An integration package connecting OpenRouter API with LangChain, providing a ChatOpenAI-compatible chat model and embeddings. Current version 0.2.3, requires Python >=3.10, <4.0.0. Depends on langchain-core (any version). Release cadence is irregular.

llm-agents ai-ml

pip install langchain-openrouter

github ↗package ↗homepage ↗docs ↗changelog ↗

INSTALL

IMPORT

SIG · LANGCHAIN-OPENROUT

langchain-openrouter

llm-agentspythonv0.2.3

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

ChatOpenRouter

✓ from langchain_openrouter import ChatOpenRouter

✗ from langchain_openrouter import ChatOpenAI

Initialize the ChatOpenAI model via OpenRouter and invoke it

from langchain_openrouter import ChatOpenAI llm = ChatOpenRouter(model_name="openai/gpt-4o-mini") response = llm.invoke("Hello") print(response.content)

Debug

Known issues

gotchaThe parameter name for the API key in `ChatOpenAI` is `openai_api_key`, not `api_key` or `openrouter_api_key`.

fix

Use `openai_api_key='your-key'` when initializing ChatOpenAI.

affects: all

gotchaThe package exports the model class under the name `ChatOpenRouter` (alias), but the correct class name is `ChatOpenAI`. Using `ChatOpenRouter` may confuse users looking for the actual class.

fix

Import `ChatOpenAI` from langchain_openrouter; do not use `ChatOpenRouter` in code.

affects: all

deprecatedThe `model_name` parameter is deprecated in favor of `model`. This applies to the underlying LangChain ChatOpenAI class.

fix

Use `model='openai/gpt-4o-mini'` instead of `model_name='openai/gpt-4o-mini'`.

affects: >=0.3.0

Upgrade

Version history

0.2.3latest on PyPI · released May 1, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

24 hits · last 30 days

node

Amazon

OpenAI (training)

Resources

githubhttps://github.com/langchain-ai/langchain ↗

packagehttps://pypi.org/project/langchain-openrouter/ ↗

homepagehttps://docs.langchain.com/oss/python/integrations/providers/openrouter ↗

docshttps://reference.langchain.com/python/integrations/langchain_openrouter/ ↗

changeloghttps://github.com/langchain-ai/langchain/releases?q=%22langchain-openrouter%22 ↗