Cartesia Voice Agent Example

This is a demo of a LiveKit Voice Pipeline Agent using Cartesia and GPT-4o-mini.

The example includes a custom Next.js frontend and Python agent.

Live Demo

https://cartesia-assistant.vercel.app/

Running the example

Prerequisites

• Node.js
• Python 3.9-3.12
• LiveKit Cloud account (or OSS LiveKit server)
• Cartesia API key (for speech synthesis)
• OpenAI API key (for LLM)
• Deepgram API key (for speech-to-text)

Frontend

Copy .env.example to .env.local and set the environment variables. Then run:

cd frontend
npm install
npm run dev

Agent

Copy .env.example to .env and set the environment variables. Then run:

cd agent
python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
python main.py dev