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langchain/libs/partners/perplexity/README.md
Sydney Runkle 3814bd1ea7
partners: Add Perplexity Chat Integration (#30618) 
Perplexity's importance in the space has been growing, so we think it's
time to add an official integration!

Note: following the release of `langchain-perplexity` to `pypi`, we
should be able to add `perplexity` as an extra in
`libs/langchain/pyproject.toml`, but we're blocked by a circular import
for now.

---------

Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Chester Curme <chester.curme@gmail.com>
2025-04-03 16:09:14 +00:00

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langchain-perplexity

This package contains the LangChain integration with Perplexity.

Installation

pip install -U langchain-perplexity

And you should configure your perplexity credentials and then set the PPLX_API_KEY environment variable.

Usage

This package contains the ChatPerplexity class, which is the recommended way to interface with Perplexity chat models.

import getpass
import os

if not os.environ.get("PPLX_API_KEY"):
  os.environ["PPLX_API_KEY"] = getpass.getpass("Enter API key for Perplexity: ")

from langchain.chat_models import init_chat_model

llm = init_chat_model("llama-3.1-sonar-small-128k-online", model_provider="perplexity")
llm.invoke("Hello, world!")