Use Lytix to manage your evaluation and usage diretly with the Langchain SDK. Gain access to models across providers and manage your usage and billing.

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Quickstart

Prerequisite First create a lytix account here

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Create a Lytix API Key

Start by creating and noting down a lytix api key. See instructions here

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Install the Langchain SDK

Python
pip install -qU langchain-openai

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Initialize the ChatOpenAI client

Python
from langchain_openai import ChatOpenAI

model = ChatOpenAI(
    model="gpt-4o-mini", 
    # Update your api key to the lytix api key
    base_url=f"https://api.lytix.co/proxy/v1/openai", 
    # Update your api key to the lytix api key
    api_key="$LYTIX_API_KEY",
    default_headers={
        # Move your openai key to the default headers
        "openaiKey": "$OPENAI_API_KEY"
    },
)

🇪🇺 Note You will need to use https://eu.api.lytix.co/proxy/v1/openai if you are in the EU region.

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Continue Using Langchain Normally!

You can now continue using Langchain as you normally would and use this model as you would any other Langchain model.

Typescript
messages = [
    (
        "system",
        "You are a helpful assistant that translates English to French. Translate the user sentence.",
    ),
    ("human", "I love programming."),
]

response = model.invoke(messages)
print("Got response: ", response)

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Optional Fields

You can pass these fields by updating your model as follows:

Python
model = ChatOpenAI(
  model="gpt-4o-mini",  # Update your base url to the lytix proxy
  base_url=f"https://api.lytix.co/proxy/v1/openai",
  # Update your api key to the lytix api key
  api_key=LYTIX_API_KEY,
  default_headers={
      ...,
      # Optional fields
      "userId": "sid@lytix.co",
      "workflowName": "Example workflow",
      "cacheTTL": "60",
      "sessionId": "1234567890",
  },
)

Langchain supports the following optional fields with Lytix:

  • sessionId: You can pass a sessionId to track usage for a specific session.
  • userId: You can pass a userId to track usage for a specific user.
  • workflowName: You can pass a workflowName to track usage for a specific workflow. Learn more about workflows here.
  • cacheTTL: You can pass a cacheTTL to cache the response for a specific amount of time. Learn more about caching here.
Gemini Integration[Deprecated] OptiModel