Build a voice agent with LangChain

Learn how to build a speech-to-text voice agent using LangChain.

We break down the two methods of building voice agents and several of the key considerations for using each architecture:
1. STT / LLM / TTS ("The Sandwich")
2. S2S ("Realtime")

Voice agent docs:
Typescript: https://docs.langchain.com/oss/javascript/langchain/voice-agent
Python: https://docs.langchain.com/oss/python/langchain/voice-agent

Voice sandwich demo repo:
https://github.com/langchain-ai/voice-sandwich-demo

Learn how to build agents with LangChain on LangChain Academy: https://academy.langchain.com/collections/quickstart/?utm_medium=social&utm_source=youtube&utm_campaign=q4-2025_youtube-academy-links_aw